Let me clarify.
You're trying to use WG account with steam?
This thread was added on October 22, 2019, with posts from Umbaretz.
Due to Steam API dependencies it's a bit harder now, but still doable/
Here is a guide for that for versions after 0.8.9: https://steamcommunity.com/sharedfiles/filedetails/?id=1890831652
You're trying to use steam client in a way it wasn't intended, so I can help you, but I should remind that it's not officially supported.