This does answer my question, but it's overkill IMO, let me try to do something with delta-io

Had the same task in a previous assignment. There is no other way than starting a job through the API from within PowerApps. For that you need running compute and leverage Serverless most likely. 

I would imagine - delta-io on azure function accessing the delta lake based on api trigger / queue etc. 

Haven't thought of that actually, yes that will work! But still you need a seperate azure function for it, which is a bit cumbersome still I would say. 

Quite interesting approach

Connect Power App to Delta table from ADLS Gen 2 | by HK Power Platform Admin | Medium

I have started creating solution for that: 

Here is initial version with PAT 

https://github.com/lakime/powerappstodelta