I didn’t know about map4d.vn — it’s a Vietnam-based tech company with a mapping service for … Vietnam POI (Points Of Interest). This kind of local approach to mapping makes so much sense.
For custom layer creation, there’s a set of open source tools that I’ll need to try out one day. The explanation is over here.
FIRMS has a way to download KMLs and other resources here. Also, there’s an API for all this information that I created a login for and succeeded at hitting this endpoint with a Bearer token:
Luckily I found a poster session PDF that let me see into how to get more info … LOL.