Call APIs using Python
Python is really good at calling APIs, and it actually gives you alle the functionality you need to call APIs no matter encryption method and format.
I would be happy to see libraries like the following supported in PBI Service:
requests enable you to call almost any type of APIs, and the other libraries are really handy (and often mandatory) for encoding/decoding and formatting.
Unfortunately, I would not be able to do all this in Power Query SDK, and I don't see why you would continue developing this when you already have such a good alternative out there :)