Nevermind, i figured it out:
Solution:
add_filter( 'fep_directory_arguments', function ($args){
$user = wp_get_current_user();
$role = $user->roles[0];
if( $role == 'delegate'){
$meta_query = array();
$comitee_post= get_field( 'comitee', 'user_'.$user->ID);
$meta_query = array(
'relation' => 'AND',
array(
'key' => 'comitee',
'value' => $comitee_post->ID,
'compare' => '='
),
);
$args['meta_query'] = $meta_query;
}
return $args;
}, 99);
Hope it helps anyone!