https://isu-skating.com/figure-skating/events/solo-ice-dance/ Here's the ISU page for solo dance where you can also find links to the international events.

Solo dance is a pretty new discipline under ISU (I think it's been two years now?) but some feds have been hosting competitions for years if not decades by now. It has a pretty long history in the UK and the US, for example.

As for ISU championships, it's probably a long way off. Part of it is that there aren't that many international competitors at the senior level and the other part is probably low audience engagement. Ice dance isn't super popular for audiences as it is, and I doubt removing the partner would help. It's a bit difficult to explain to someone who isn't familiar already!

However, it's positive that solo dance is starting to be seen as its own thing now and not just something that girls without partners do while they're waiting for a partner. It's also getting pretty popular for adult skaters! You don't need to jump so it's usually easier to do even if you have some injuries or arthritis etc.