Hide custom field in the form

Hello! I’ve added a custom field. I want this field to be visible to the administrator and to the person generating the ticket only in “my tickets,” but I don’t want it to appear in the ticket submission form. I can hide it with CSS, but I would like to know if you can provide me with a PHP snippet to hide it in the form as well, so that it can only be edited by the site administrator and appears as a “read-only” field for the user.
So far, what I have is the following:

add_action( 'plugins_loaded', 'wpas_user_custom_fields' );
function wpas_user_custom_fields() {
	if ( function_exists( 'wpas_add_custom_field' ) ) {
  wpas_add_custom_field( 'cotizacion',  array( 
			'title' => __( 'Cotizacion', 'awesome-support' ), 
			'order' => 2,
			'field_type' => 'text'
		) );
	}
}

I look forward to your response, thank you!