Connect Power Bi Semantic Model to external applications

Here is an API for querying a Power BI semantic model (aka dataset):

https://learn.microsoft.com/en-us/rest/api/power-bi/datasets/execute-queries

(It uses DAX query code, which is a bit different syntax from what you would use in your typical DAX measures or calculated columns. DAX query is the same syntax as you would use in DAX Studio or DAX query view.

I think Performance Analyzer in Power BI Desktop can be helpful for generating DAX query code. The code generated only selects TOP N rows, you might consider altering that code so it doesn't include a TOP N filter.)