Hello. I've inherited the product's view from the product.template model in a new tree view, but I've only added 5 fields to my new view. I would like to add the dollar symbol before the price in one of the fields. I've tried wth this code and is not working.

class ProductInventario(models.Model):
    _inherit = 'product.template'

    total_cost = fields.Float(string="Costo Total", compute="_total_cost", required=False)
    company_id = fields.Many2one('res.company', 'Company', default=lambda self: self.env.user.company_id.id, index = 1)
    currency_id = fields.Many2one('res.currency', 'Currency',
                                  default=lambda self: self.env.user.company_id.currency_id.id, required=True)

This is my xml code:

id="product_custom_tree_view" model="ir.ui.view">
    name="name">product.template.product.tree
    name="model">product.template
    name="arch" type="xml">
        string="Product">
            name="qty_available" string="Inventario Total"/>
            name="standard_price" widget="monetary" options="{'currency_field': 'currency_id'}" string="Costo por unidad"/>
            name="total_cost" widget="monetary" options="{'currency_field': 'currency_id'}"/>