Stage-snaps with snaps on local harddrive

I can stage a snap from the snap store like this:

parts:
audacity:
plugin: nil
stage-snaps:
- to amd64:
- audacity

How can i stage a snap that is not in the snap store, but “locally” on my harddrive?

Background:
To increase the build performance of my snap, i want to shift some long running task (which are stable and do not always have to be built again) to another snap.

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This is currently not possible and probably won’t be in the foreseeable future.

Is there any workaround proposed for what OP mentions?

On the other hand, can “stage-snaps” checkout from private/brand stores?