Community member, damned, created a rule set for Tales from the Loop for Fantasy Grounds. No content from the books but it's a fully-functioning character sheet.
https://www.fantasygrounds.com/forums/s ... m-the-Loop
Also, if you wanted to watch how he created the rule set there's a playlist available here: https://www.youtube.com/playlist?list=P ... 4PLgZ0ARfM
Happy gaming!