Don't need anything formal — if you're looking, well, I guess see if anyone else shows interest here, or ask around on Discord?
If you mean how to submit — pick a person to upload it, then add everyone else as a contributor from the game's settings page. They can then have the game listed on their own itch profiles by editing the page and unhiding the game. I just woke up and am incoherent sorry but lmk if you need screenshots or something.