I expect to achieve the following effects when using django to create a database

Table 1

CREATE TABLE Persons
(
Id_P int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Address varchar(255),
City varchar(255),
UNIQUE (Id_P),
PRIMARY KEY (LastName)
)

Table 2

CREATE TABLE Orders
(
Id_O int NOT NULL,
OrderNo int NOT NULL,
Id_P int,
PRIMARY KEY (Id_O),
FOREIGN KEY (Id_P) REFERENCES Persons(Id_P)
)

The foreign key of table 2 is related to the Id_P of table 1, not LastName

But in django

Id_P = models.ForeignKey('Persons',db_column='Id_P')

Written like this, django will automatically associate it with the primary key of the Persons table, not the Id_P

Could you please tell me how to rewrite it to achieve the desired effect?