Personalized RSS feed / Follow list

[TUSF]

At the moment, the only RSS feed shows ALL updates, for ever series. I'd like to be able to specify specific series.

Something like so would be good:
https://api.j-novel.club/rss?series=[seriesid1],[seriesid2],[seriesid3]
With the series IDs being delimited by a comma (,). This is a system I've seen done on some other sites, at least, like RRL.

Alternatively, a "Follow" feature would make this simpler, to allow people to "Follow" a series onsite, and generate a user-specific RSS feed (for those of us still using RSS readers, anyways).