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Hey!  I don't think there is a way to do this in itch.io.  I think the best thing to do is link to all your team members in your game description and what they did.  You can link to their twitter or their itch profile for example.

During the mining process, I found that there are some submitters in some games, like SpamBoy Deluxe, there are 3 submitters: Https://itch.io/jam/open-jam-2018/rate/313939

The game still belongs to a developer, but other partners can also display that game on their personal page.
Do I have a way to do this now? Thank you for your help, I think fair treatment is more important than the award: P

Ahh yes I see that now, I'm guessing there is a field when you're submitting the jam entry to add contributors?