Power Query Connecting To SQL Registered Server Group

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Hi, 

I've been searching up how to connect to a SQL Server Registered Group.  My scenario is below and unsure if there is a way to connect to the registered groups. 

1. I have a SQL server registered group for a group of retail stores local databases comprised of currently 35 stores but will ramp up to around 300.

2. I currenlty have to connect to each store in Power Query to get data form each store and append all stores data.

Now creating 30 connections is fine but when this ramps up to 300 managing each connection would be tedious work and managing the server group seems a much logical process then just connecting Power BI to that registered group. 

Any guidance would be greatly appreciated. Thanks