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Description
Is your feature request related to a problem? Please describe.
I'm working on a custom template for another project and I find myself in need to filter functions of a class based on their labels. Since I can't, and since I have to iterate twice on the functions, I have to use a condition on the labels twice.
Describe the solution you'd like
Probably add a parameter to filter_objects to accept labels. They should all be present, just like Griffe's Object.has_labels.
Describe alternatives you've considered
Checking labels in conditions.