As far as I know it can. Even though I don’t have a default set myself, my default template used to have “fixings” layer saved into it but I changed things up a little while ago. I have a special script that Steve Baumgartner wrote for me to create custom named layers from the component definitions in the model and assign them when I’m ready to create scenes.
See that here if it’s of interest to anyone, although it’s not really suitable for this case.
https://forums.sketchup.com/t/auto-populate-layers-and-assign-from-component-definitions/72949?u=iant