If you export the game to .exe file, sure, you can put that to itch.io. I didn't put any games on gamejolt so I cannot say for sure.
But if you want to export to html, I'm afraid I cannot help you with that, but I do know a page that can help you though:
LÖVE Web Builder · Home (schellingb.github.io)
I haven't tried it before, but you can try it out to see if it works for you!
Hope this help!