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:
Most of us don’t need much convincing that stakeholder management is important. It just makes sense that keeping everyone in-the-know on projects and assigning clearly defined roles is key to having ...
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