Some measurements are available on the asset editor wiki, e.g. for walls:
https://github.com/Parkitect/ParkitectAssetEditor/wiki/wall

Is there any way to get measurements of other assets?
e.g. extracting the models/meshes and taking measurements in a 3d modelling program like blender?

This would be good to know for e.g. creating new windows for the existing wall-with-window-opening pieces.