Django 通过 OrderingFilter 过滤平均和

我需要通过OrderingFilter过滤平均(非模型)字段.

我的Models.py

class Product(models.Model):
    store = models.ForeignKey(Store, on_delete=models.CASCADE, null=True, verbose_name="store")
    sku = models.CharField(max_length=255, blank=True, default="", verbose_name="SKU")
    name = models.CharField(max_length=255, blank=True, default="", verbose_name="name")

class ProductInfo(models.Model):
    default_related_name = "productinfo"

    product = models.OneToOneField("Product", on_delete=models.CASCADE, null=True, verbose_name="product")
    barcode = models.CharField(max_length=255, null=True, verbose_name="barcode")
    price = models.DecimalField(max_digits=7, decimal_places=2, default=Decimal(0), verbose_name="price")
    cost_price = models.DecimalField(max_digits=7, decimal_places=2, default=Decimal(0), verbose_name="cost price")
    vat = models.DecimalField(max_digits=3, decimal_places=1, default=Decimal(0), verbose_name="% tax")

I通过OrderingFilter过滤产品

我的filters.py

from products.models import Product
from django_filters import OrderingFilter
from django_filters.rest_framework import FilterSet

class ProductFilter(FilterSet):
    order_by_field = "ordering"
    ordering = OrderingFilter(
        fields=(
            "name",
            (("productinfo__price"), ("price")),
            (("productinfo__barcode"), ("barcode")),
        )
    )

    class Meta:
        model = Product

我需要计算一下销售的利润.这可以在单独的函数中完成，也可以使用注释. price-cost_price-taxes_sum=profit个 但此参数不是模型字段.我可以以某种方式将其添加到过滤器中吗？目标是通过分拣获得能带来更多利润的商品.