'How to override Django Q() model?

I want to query like this in Django ORM

from django.db.models import Q
MyModel.objects.filter((Q(flag=True) & Q(model_num__gt=15)) | (Q(flag=True) & Q(model_num__lt=7)))

Are there any way I can restrict the (Q(flag=True) & Q(model_num__gt=15)) results to only first query element?

Do we need to override Q model or we are having another apporach?

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