I am using Laravel v:9.52.16 on PHP 8.1.0

According to the documentation of Laravel Voyager Custom relationship attributes:

Suppose I have a PlatformCategory Model and its related table in the database contains f_name and l_name columns. I need to show the full name on the related models inside the Voyager admin panel dashboard of the PlatformCategory by using custom relationship attributes.

I’ve tried the following:

public $additional_attributes   = ['full_name'];
public function getFullNameReadAttribute()
{
    return "{$this->f_name} {$this->_name}";
}

However, this results in the following error:

QueryException
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'full_name' in 'field list'
SELECT `full_name`, `id` FROM `platform_categories` WHERE 0 = 1 AND `platform_categories`.`deleted_at` IS NULL
The error message indicates that the database query is attempting to select a column called full_name, but it doesn't exist in the platform_categories table.

How can I fix this issue and display the full name of the PlatformCategory model in the Voyager admin panel?