Creating a non-human connection in Power BI Service to query DMVs via XMLA endpoint (Import Mode)

Goal: 
Create a non-human connection in the Power BI Service (PBIS) that connects to the semantic model DMV views to run queries using Import mode.
Why: 
Until we have a more robust platform in place, I have been documenting our semantic models in Excel. Among other information, this includes measures, tables/columns, and the SQL statements in each applicable dim and fact table.
How:
In DAX Studio, I run the applicable queries and output the results to the Excel document. This document is available to a select group of individuals who perform validations on reports that are built off of the semantic model. 

As a next step in this process, we would like to eliminate the Excel document and instead add the output of those queries, as tables, in the model itself, and then create a report off of the model that would be published to PBIS for these individuals to view. These reports output exactly what was in the Excel document: a clear list of measures, tables/columns, and the SQL statements for the facts and dims. Moving towards a more self-documenting method.

What I've done:
In Power BI desktop, I create the tables for the measures, tables and table columns from the respective view (example: INFO.VIEW.MEASURES).
However, for the SQL statements, I get this information using the SQL Server Analysis Services connection, where the server is the XMLA endpoint obtained from PBIS, and authentication is my Microsoft account for credentials. I created a table called model_SQL that has the following query:
SELECT
[TableID],
[QueryDefinition]
FROM $SYSTEM.TMSCHEMA_PARTITIONS

Next, I deploy the model to PBIS. 
In PBIS, in the model settings, I see 2 options to create a connection.

1. Gateway connections (we have an on-premises data gateway):
Under this section, the AnalysisServices connection shows as 'Optional - Add to gateway'.
If I select this option, the only authentication method is Windows.

2. Cloud connections:
Under this section, the AnalysisServices connection shows Maps to Personal Cloud Connect or clicking on the drop-down the options are: Basic, OAuth 2.0, Workspace identity. 

I would like to use Service Principal but would entertain another non-human account that works in the same way, provided our setup allows it.

Looking for guidance on options to create this non-human account for the AnalysisServices authentication (or if there's another way I should connect) on the model.

If I'm missing any information that may be helpful in your response, please let me know.

Many Thanks!
Maria