How can I generate an annotated field with list of values in Django queryset?

I need to make up an advanced query that allows me get a queryset containing dictionaries with strings for keys and lists with all possible values for values. Here is what I got:

In [26]: Offer.objects.values('partner', 'partner_id')Out[26]: <QuerySet [{'partner': 'xex', 'partner_id': 'x_999'}, {'partner': 'xex', 'partner_id': 'x_888'}, {'partner': 'quiup', 'partner_id': 'q_888'}, {'partner': 'quiup', 'partner_id': 'q_777'}]>

Here is what I need to get:

<QuerySet [{'partner': 'xex', 'partner_ids': ['x_999', 'x_888']}, {'partner': 'quiup', 'partner_ids': ['q_888', 'q_777']}

I've tried annotations, F-expressions, `Value`, `.dictinct('partner')` but nothing brings me any closer. Any suggestions will be much appreciated and thank you very much for your attention.

UPD. Related model provided:

class Offer(models.Model):partner = models.CharField(    verbose_name='Partner',    max_length=50)partner_id = models.CharField(    verbose_name='Partner ID',    max_length=100,    unique=True,    null=False,    blank=False,    default='')def __str__(self):    return f'{self.partner} - {self.partner_id}'