I inherited the partner model as follows:

class PartnerExt(models.Model):
    _inherit = 'res.partner'
    cars = fields.One2many('contact.cars', 'partner_id', string='Cars')

class Car(models.Model):
     _name = 'contact.cars'
     _rec_name = "car_name"
     car_name = fields.Char(string="Car")
     price = fields.Char(string="Price" )

I have this inside base view partner form:

< field name="cars" />

But it shows only the car names and not the prices.

How can I show the prices for each car?

Thank you