Two units of measure Units and Weight (Woocommerce)

I have a problem.
I have two units of measure in my store (unit and weight).
I tried to put the information right after the input according to the unit.
I would like to have both units as shown.
I tried to use the function below, but it didn’t work.
I need to put a background according to the category. Thanks

add_filter( 'woocommerce_quantity_input_args', 'min_qty_filter_callback',  20, 2 );

function min_qty_filter_callback( $args, $product ) {
$category = 17; // The targeted product category
$min_qty  = 1; // The minimum product quantity

$product_id = $product->is_type('variation') ? $product->get_parent_id() : $product->get_id();

if( has_term( $category, 'product_cat', $product_id ) ){
    $args['min_value'] = $min_qty;
    $args['step'] = 1;
    $args['backgroud'] = 'FFFFFF';
}

return $args;