Mapbuilding Tools for an Original TTRPG Game Setting

It's been a couple of decades since I've run a game. I have always used my own settings (unless I'm doing a near-futures scenario in our own world).

I found one of the planet-generation sites and eventually got it to generate something almost right, which I now have as a screenshot and a PSD (Photoshop) file that I can tweak in the Photopea image editing site.

I'll want something more TTRPG friendly when I get down to city maps etc. though.

Do any of the programs like Inkarnate allow you to import a file like a JPG or PNG as a starting point for a map of a nation, a region, or a city?