The Content by Label macro allows you to filter by parent. Have you had a look at that? The only downside is that it does display the title of the content that uses the specific label.
Otherwise, I have created a feature request to be able to restrict the Labels List Macro further that you're welcome to follow and vote on:
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Hi Community, Jessica here from the Confluence Product Marketing team! July’s community challenge is all about sharing pictures — and as an extension of our first post on what ...
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