Import list: https://wiki.servarr.com/en/lidarr/supported#lists
And I use https://ytmdesktop.app/ on the desktop which has last.fm scrobbling built in.
I also run the last.fm scrobble app on my phone, though it's honestly a bit hit and miss. Probably Android updates breaking it's ability to read notifications and/or stay running. Seems to be working at the moment mind you.
I have 200,000ish scrobbles on last.fm