Django - Edit fieldset field options

Question

so I have a Model that contains a ManyToMany attribute and in the fieldset this displays a full list for this attribute to edit or create. But, in this model I want to show just the active objects on fieldset for create/edit, how can I do it? I tried to write functions, get functions... The only way is merge a function and readonly but is not editable...

Models.py

class MyModel(models.Model):
    active: booleanField()

So, I want to show in fieldsets just the active=True objects