Sorry, I don't understand the question.  Can you word it a bit differently to help me understand?  Thank you

That is possible on the sports cards website already.

https://www.sportscardspro.com/contribute

Fixed in code.  The update will show up on the site with the next server update, usually about 24 hours.  Thank you.

Closing as a duplicate.  https://pricecharting.userecho.com/communities/1/topics/1002-add-games-for-mac

Closing as duplicate.  Please vote for the existing issue.

https://pricecharting.userecho.com/communities/1/topics/894-adding-a-friend-feature

This is added now.  Closing.

Which toy lines would those be specificially?

Thank you.  We do not track language specific games yet, but this request will be a good one to see how popular the idea is with other users.