I've built https://localizer.dev last week when I couldn't find a solution that fit my needs. You can play with it live here: https://localize.todorant.com.
I just needed a simple place where I can store all of my translation strings and upload/download them over a simple API, as well as be able to send a link to whoever wants to help with translations.
It generates a simple JSON with all the translations — the article on how to set up Localizer contains example scripts (taken from my projects) on how this JSON can be parsed and converted into multiple formats :)