If you've taken part in a project, but are not the member who submitted it, but for example the composer, how do you have it show up on your profile that you have indeed done it?
If you were marked as a contributor on the jam page by the submitter I believe it should show up on your profile and if it doesn't you may need to go to your dashboard and mark it as 'unhidden'. If none of those work you could create a collection of the games you've worked on and display that collection on your profile.