I'm using unity's metalness/smoothness workflow so i need to invert the roughness exported from toolbag, is there a way to do this without manually inverting the exported map?
If you're working with a texture project yes, there are a couple of ways:
When you set up the project, remove the roughness map and add a gloss map in the project maps section. Gloss is inverted roughness/the same thing as smoothness and you can work directly in this value system (materials from the library will automatically be converted)
Before export, add an invert layer (adjustment layer dropdown) to the top of the stack and disable all but the roughness map (alt+click to quickly isolate) - this is the easiest way to do it for existing projects
If baking you can select a gloss map from the map types list rather than a roughness map as well.
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If baking you can select a gloss map from the map types list rather than a roughness map as well.