Preset colour White to Transparant for Snapshot feature

Siem

We would like to preset the Mask colour of a symbol so that this doesn't need to be edited afterwards for every snapshot while creating a library from a PDF with all the symbols on a white background.

It is a lot of repetative work to change the colour White of every symbol to transparant.

Also it would be great to have a Bulk Edit Coulors feature that supports converting e.g. White to transparent.