https://www.youtube.com/feeds/videos.xml?channel_id=[Channel ID here]
With a simple for loop in bash, I added them to the list of my rss feeds. I had 50+ youtube channels and didn't want to make something complicated.
[0] https://git.codemadness.org/sfeed/file/sfeedrc.example.html#...
https://www.youtube.com/feeds/videos.xml?channel_id=[Channel ID here]