For the employee field you should use an OnChange event in the Vehicle field so that when the Vehicle is selected you run the query to get the employee where the id matched to that vehicle.... if that makes sense... kind of difficult to write a solution without really seeing your db structure.
Glad it is solved but the one thing I notice throughout your posts for this app you're building is that your data structure seems inconsistent.... how is asignado the same as an id?
You may want to consider changing the column name in the database from asignado to user_asignado_id so that it will be easier to understand the relationships....(Just my opinion)
yeah im using a table from a laravel app, what im doing example i created a vehicles table, and inside i will put a field named: assigned_to or assigned_id and i link that to my users or employees tables users.id
what i did was to concat first and last name directly on postgresql query to use only {{ obtenerColaborador.data.asignado['0'] }} and that gets me full name, and if its empty the first field then it will show as empty