How to custom ForeignKeyField name?

[ChenXiangcheng1]

class WPKAccount(Model):
    accountid = fields.CharField(255, pk=True)

class WPKPosition(Model):
    account: fields.ForeignKeyRelation[WPKCapital] | None = fields.ForeignKeyField('models.WPKCapital', related_name='positions', db_constraint=False)

  {
      "accountid": "1",
      "positions": [
          {
              "account_id": "1",
          }
      ]
  }

It's terrible for me，I dont want to use accountid as my ForeignKeyField name. What should I do?