Call Power BI Rest API from Power BI Desktop

Hi, 

Would really love to see this works since i cant even think about all the possibilities. 

Is it possible to call Power BI REST API from Power BI desktop? 

I am creating admin documentation and listing all datasets within my tenant and want to join these to used Gateways. I dont want to list all manually since there are around 40 Gateways and a couple of hundred datasets.

My test was to create a function in Power BI desktop which retrieves Gateway ID from my list of datasetID from Power BI REST API - https://docs.microsoft.com/en-us/rest/api/power-bi/datasets/getdatasources

BUT, it dont allow access when i try to invoke the function over the table of datasetIDs, 

Is there something else handy i could do to get all of this information? Or am i thinking about this completly wrong? have googled alot but nothing unfortunatly so now i turn to the almighty community.

All the best

/D