How to write query nested subquery using Djnago ORM?

Question

please help me to write something like this query using Django ORM:

SELECT label from (
    SELECT DISTINCT on (label)
       unnest("auditorial"."labels") AS "label"
       FROM "auditorial"
    ) as subQ
 WHERE upper(label) LIKE upper('%rec%')
 ORDER BY label

If I have model like this:

class Auditorial(models.Model):
    labels = ArrayField(
        models.CharField(max_length=64, blank=True)
    )

I need to provide "suggestions" into select input on website

Thank you!