How do you extend Template App Dataset with additional data (merge other datasets with template app datasets)

Power BI
2

Hello Nicola,
I think your template app is stringent with the datasets mashup. It all depends on how the developer contributed the template app as.
Refer to https://datachant.com/2019/02/08/template-apps-in-power-bi/ for some deep understanding on this subject.
Good luck!
Indira