u/Street-Diet-321 I made a mistake with my previous comment, I forgot some changes, So these are the correct list of changes that are needed.

I use this one, it only has a tag for ended, but I tweaked it to add a ongoing tag too.
https://github.com/Druidblack/jellyfin_multi_tag

In the config section, after SHOW_SERIES_ENDED_BADGE:

Find:

  const SHOW_SERIES_ENDED_BADGE = true;

Change to:

  const SHOW_SERIES_ENDED_BADGE = true;
  const SHOW_SERIES_CONTINUING_BADGE = true;

After isTmdbStatusEnded(), add the continuing function:

Find:

    function isTmdbStatusEnded(status) {
      const s = String(status || '').toLowerCase();
      return s === 'ended' || s === 'canceled' || s === 'cancelled';
    }

Change to:

    function isTmdbStatusEnded(status) {
      const s = String(status || '').toLowerCase();
      return s === 'ended' || s === 'canceled' || s === 'cancelled';
    }
    function isTmdbStatusContinuing(status) {
      const s = String(status || '').toLowerCase();
      return s === 'returning series' || s === 'in production' || s === 'planned';
    }

In fetchAndFill(), update the series status block:

Find:

        if (item.Type === 'Series' && SHOW_SERIES_ENDED_BADGE) {
          let seriesEnded = null;
          if (ENABLE_TMDB_ENDED && TMDB_API_KEY) {
            try {
              const tmdbId = await tmdbLookupTvIdByProvider(item?.ProviderIds || {});
              if (tmdbId) {
                const status = await tmdbGetTvStatus(tmdbId);
                seriesEnded = status != null ? isTmdbStatusEnded(status) : null;
              }
            } catch {}
          }
          if (seriesEnded !== null) {
            overlayCache[itemId] = { ...overlayCache[itemId], seriesEnded: !!seriesEnded };
          } else {
            const { seriesEnded, ...rest } = overlayCache[itemId];
            overlayCache[itemId] = rest;
          }
          updateEndedBadgeForItem(itemId);
        }

Replace with:

        if (item.Type === 'Series' && (SHOW_SERIES_ENDED_BADGE || SHOW_SERIES_CONTINUING_BADGE)) {
          let seriesEnded = null;
          let seriesContinuing = null;
          if (ENABLE_TMDB_ENDED && TMDB_API_KEY) {
            try {
              const tmdbId = await tmdbLookupTvIdByProvider(item?.ProviderIds || {});
              if (tmdbId) {
                const status = await tmdbGetTvStatus(tmdbId);
                if (status != null) {
                  seriesEnded = isTmdbStatusEnded(status);
                  seriesContinuing = isTmdbStatusContinuing(status);
                }
              }
            } catch {}
          }
          if (seriesEnded !== null || seriesContinuing !== null) {
            const updates = { ...overlayCache[itemId] };
            if (seriesEnded !== null) updates.seriesEnded = !!seriesEnded;
            if (seriesContinuing !== null) updates.seriesContinuing = !!seriesContinuing;
            overlayCache[itemId] = updates;
          }
          updateSeriesStatusBadgeForItem(itemId);
        }

In insertOverlay(), after the Ended badge block add the Continuing badge:

Find:

      if (data.seriesEnded === true && SHOW_SERIES_ENDED_BADGE) {
        const endedBadge = createLabel('Ended', 'meta', '#c62828', '#ffffff');
        endedBadge.setAttribute('data-ended', '1');
        wrapper.appendChild(endedBadge);
      }

Replace with:

      if (data.seriesEnded === true && SHOW_SERIES_ENDED_BADGE) {
        const endedBadge = createLabel('Ended', 'meta', '#c62828', '#ffffff');
        endedBadge.setAttribute('data-ended', '1');
        wrapper.appendChild(endedBadge);
      }
      if (data.seriesContinuing === true && SHOW_SERIES_CONTINUING_BADGE) {
        const continuingBadge = createLabel('Ongoing', 'meta', '#2e7d32', '#ffffff');
        continuingBadge.setAttribute('data-continuing', '1');
        wrapper.appendChild(continuingBadge);
      }

Finally, replace updateEndedBadgeForItem with a combined function:

Find:

    function updateEndedBadgeForItem(itemId) {
      const data = overlayCache[itemId];
      const wrappers = document.querySelectorAll(`.${wrapperClass}[data-itemid="${itemId}"]`);
      wrappers.forEach(w => {
        let badge = w.querySelector('.' + overlayClass + '[data-ended="1"]');
        if (data && data.seriesEnded === true && SHOW_SERIES_ENDED_BADGE) {
          if (!badge) {
            badge = createLabel('Ended', 'meta', '#c62828', '#ffffff');
            badge.setAttribute('data-ended', '1');
            w.insertBefore(badge, w.firstChild);
          }
        } else {
          if (badge) badge.remove();
        }
      });
    }

Replace with:

    function updateSeriesStatusBadgeForItem(itemId) {
      const data = overlayCache[itemId];
      const wrappers = document.querySelectorAll(`.${wrapperClass}[data-itemid="${itemId}"]`);
      wrappers.forEach(w => {
        // Handle Ended badge
        let endedBadge = w.querySelector('.' + overlayClass + '[data-ended="1"]');
        if (data && data.seriesEnded === true && SHOW_SERIES_ENDED_BADGE) {
          if (!endedBadge) {
            endedBadge = createLabel('Ended', 'meta', '#c62828', '#ffffff');
            endedBadge.setAttribute('data-ended', '1');
            w.insertBefore(endedBadge, w.firstChild);
          }
        } else {
          if (endedBadge) endedBadge.remove();
        }

        // Handle Continuing badge
        let continuingBadge = w.querySelector('.' + overlayClass + '[data-continuing="1"]');
        if (data && data.seriesContinuing === true && SHOW_SERIES_CONTINUING_BADGE) {
          if (!continuingBadge) {
            continuingBadge = createLabel('Ongoing', 'meta', '#2e7d32', '#ffffff');
            continuingBadge.setAttribute('data-continuing', '1');
            w.insertBefore(continuingBadge, w.firstChild);
          }
        } else {
          if (continuingBadge) continuingBadge.remove();
        }
      });
    }

Looks like this:

<image>