Anyway to wander off topic, for your paticular use case:
Call: https://dev.twitch.tv/docs/api/reference#get-users-follows to get all the people you follow then call https://dev.twitch.tv/docs/api/reference#get-streams 100 users at a time. I don’t expect Twitch to add the “get followed streams” end point to helix it’s solved with a few requests to Helix.