Below is a part of a material I downloaded from editor.
The diffuseMap value is a relative path against the map json file.
Can I use dataurl of image for the map?
I am not sure if the asset registry can parse and load a material .json resource that contains a base64 image.
If not, you can definitely parse and load it in your code, check this, it’s for an audio asset but the logic is the same:
I’ve just tried this in a project and unfortunately, this is not possible to use a base64 URI in the material JSON at the moment.