Semantic Segmentation single PNG export format with only one label per region

**Is your feature request related to a problem? Please describe.**
Not a problem exactly, it is a feature. It would be amazing if you guys could add a new semantic segmentation ouput format that exports a single PNG label image with the same colors that have been defined in the labels.

**Describe the solution you'd like**
Export a single PNG with the different segmentation regions and their selected color, exactly the same as in the interface and with only one color in overlapping regions (the top layer).

**Describe alternatives you've considered**
I could write an external script, but not the best option.