Spark noob, 2 questions about billing and api

First question is a config question - I'd like to have billing plans that include individual and team plans, basically like github. Since my SaaS will have features for individual and teams, i'd like to offer free individual, pro individual (+features), and pro teams (size A + features, size B + features) I'm not sure how to set that up, looks like my user plans are only available to users who dont own any teams. I'd also like to make it mandatory to have a subscription for a team.

Second, I'm developing a companion mobile app which I need to authenticate using my spark user. I need to provide a JWT which I can do normally outside of spark, but aside from api token which are not my use case, I wasn't sure if there was an already established approach with spark, of am I free to use socialite for JWT?