searching a model in admin with data from a related model

consider this model (only a portion of it):

class Tracker (models.Model):
id = models.AutoField (primary_key=True)
Barcode = models.IntegerField(unique = True, blank=False)
OrderId = models.IntegerField(blank=False)
CustomerId = models.CharField (max_length=20, blank=False)
[[sniped]]

when you view the Tracker model in /admin on the list page, there is a
search box in the top right corner. Is it possible to search on
another model called Customer for Customer.firstname,
customer.LastName? If you notice we have CustomerId as a charfield...
if we changed that to a foreign key, is it possible to search the
Tracker model by customer firstname/lastname and if so, how?

thanks in advance!

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