Here's a bash command to get the URL of a YouTube channel's feed from the channel URL using yt-dlp and a bit of sed magic, using the channel from
@cinimodevDom ๐ฆป as an example:
yt-dlp --playlist-items 0 -O playlist:channel_url --print channel_url https://www.youtube.com/@dominiccorriveau | sed 's/channel\//feeds\/videos.xml?channel_id=/'