I think the right way within the HeroLab approach would be a configuration on the Familiar Mascot feat where you select one of your chosen master abilities. The main thing is to show that you've selected all the master/familiar abilities you need to, but not show abilities/actions on the sheet from the one you've given away.
Like Share Senses shows a Share Senses action on the Play tab. Cantrip Connection adds a cantrip slot to your daily spells. But if it's selected for Familiar Mascot, that shouldn't happen.
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