Well, commonly that mini map at the corner is just an image with points on it.
You just need a program or online service that let you create this image on 3D and later download that image to use it on your virtual tour.
I know that several services let you add this minimap normally its called “floor plan” and you just need use that image.
The only service that I know is this:
https://home.by.me/en/gallery
But if you search on google you will find similar. In “home.by.me” let you create a project for free, so you can use it. If you need more project you need to pay for it
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