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My apologies, I must have overlooked your question and looping in by Brian.
I only just noticed the topic; a while ago I started on something in mapping (scenarios) (cannot even recall what it was for) and found a pbix on the web to serve my purpose, which I reworked, and this holds a NZ region map.
I do not recall the source of the file, I am not taking credit for it but hope it will be of help to you. regions_245617447374388576.JSON (397.5 KB) Test Dyn Territories Shape Map NZ.pbix (149.1 KB)