Power BI addin/custom connector?

Hello everyone,

I'm currently working on a migration from tableau to Power BI, but in tableau, a custom connector in javascript has been deployed.
According to tableau Documentation, this is the step required to build this kind of connector:dd

• Step 1: Configure your connector’s properties
• Step 2: Create the user interface
• Step 3: Edit the connector object
• Step 4: Update the fetcher file
• Step 5: Configure how the data is presented
• Step 6: Build your connector

This connector allows users to select some fields, then a request is send to a server via API, and the result return a table with the selected columns. I had a look on cusotm connector in Power BI, but it is not the same than in talbeau, I read all documentation about Power BI sdk and Watched many videos on youtube, but I found nothing relevant...

So is there a way to embedded this frontend application, translate it into query, send the query to the web site and send back the right data?

Have I to build a custom connector? Or is have I to develop an addin like in Excel?

Many thanks in advance for your help