How can I create two eloquent belongsto relationships on the same two models?

I've got an Accounts table and a People table in my database and I'm trying to set up models with accurate Laravel eloquent relationships.

The tables are linked via a contact_id column.

The People table contains employees as well as customers- the only difference is the value of the contact_id_type column in the Accounts table, which can be either "Customer" or "Employee".

Accounts
    +------------------------------------------------+
    | id | account  | contact_id | contact_it_type  |
    +-----------------------------------------------+
    | 1 | XYZ-67890 | 9876543210 | Employee         |
    | 2 | XYZ-56781 | 9876543211 | Customer         |
    | 3 | XYZ-56792 | 9876543212 | Employee         |
    | 4 | XYZ-46793 | 9876543213 | Customer         |
    | 5 | XYZ-45894 | 9876543214 | Employee         |
    +-----------------------------------------------+

People
    +--------------------------------------------------------+
    | id         | fname | lname  | email                    |
    +--------------------------------------------------------+
    | 9876543210 | John | Doe     | john.doe@example.com     |
    | 9876543211 | Jane | Doe     | jane.doe@example.com     |
    | 9876543212 | Peter| Parker  | peter.parker@example.com |
    | 9876543213 | Mary | Jane    | mary.jane@example.com    |
    | 9876543214 | Bruce| Wayne   | bruce.wayne@example.com  |
    +--------------------------------------------------------+

I've made the following Account model. How can I incorporate the contact_id_type so that the relation is correct?

class Account extends Model
{
    public function employee(): BelongsTo
    {
        return $this->BelongsTo(Person::class, 'contact_id')
    }
    

    public function customer(): BelongsTo
    {
        return $this->BelongsTo(Person::class, 'contact_id')
    }
}

source https://stackoverflow.com/questions/77455100/how-can-i-create-two-eloquent-belongsto-relationships-on-the-same-two-models