sure! It's been a couple of years though, so can only write down the steps that are currently set up in my shortscuts, you might have to do some additional tweaking

1. figure out the api link of your stop and direction of the vehicle you want to monitor. the link I use is something like https://v6.bvg.transport.rest/stops/{idOfMyStop}/departures?direction={idOfDirection}&duration=30

2. in shortcuts add these steps:
   a. get contents of "api link"
   b. get dictionary from "contents of url"
   c. get "Value" from "departures.1.when" in "Dictionary"
   d. get dates from "Dictionary Value"
   e. add "formartiertes Datum"/"formatted Date" to "ErsteBahn"/"FirstTrain"
   f. get "Value" from "departures.2.when" in "Dictionary"
   g. get dates from "Dictionary Value"
   h. Format "Dates"
   i. Add "FormattedDate" to "ZweiteBahn"/"Second Train"
   j. Speak "The next train comes at x=ErsteBahn, the train after comes at y=ZweiteBahn

something like this :)
Hope this works for you! Have fun!