How can I get Q objects from a filter set?

[taobojlen]

I'm using django-filter to filter down querysets.

Now, in another part of my code, I want to use the same filter set, but I won't want to filter a queryset -- instead, I want to filter an aggregation. Is is possible to get a Q-expression from django-filter?

For example, say I have

class Bar(models.Model):
  foo = models.ForeignKey(Foo, on_delete=models.CASCADE)

class Foo(models.Model):
  def get_bar_count(self, filters: dict[str, Any]) -> int:
    bar_filter = BarFilter(data=filters, queryset=self.bar_set.all())
    return bar_filter.qs.count()

and now I want to use this as an annotation. Can I do something along the lines of

bar_filter = BarFilter(data=filters, queryset=Bar.objects.all())
foos = Foo.objects.all().annotate(bar_count=Count("bar_set", filter=bar_filter.get_q_objects()))