Check the below example:

class Product(models.Model):
_name = 'product.product'

name = fields.Char()
price = fields.Char()

prod_name = fields.Char(compute="_compute_product_name", string="Product Name")

def _compute_product_name(self):
for rec in self:
rec.prod_name = rec.name + " " + rec.price

In tree view you can add a field like this:

<tree>
<field name="prod_name" />
</tree>