disable (read only) a field if within a custom post type name

Looks like I’ve found a way.
i’ve managed to find the field name in mysql :

function acf_read_only( $field ) {
    $field['readonly'] = 1;
    $field['disabled'] = true;
return $field;
}

add_filter('acf/load_field/key=field_5e144c7878e7f', 'acf_read_only');

SOLVED !

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