I would like some help if possible with some code that i have on my Fabric Store which adds a custom message to help the customer how much fabric they are ordering.

You can see here how the message is presented and changes with the change of quantity:
https://thefabricboutique.co.uk/product/pastel-abstract-viscose-linen-blend/

Add 0.5 metre for £6.25

I would like to know how to change this to the following code:

Add 1 unit for 0.5 metre (£6.25 for 0.5 metre)

So just adding ‘Add 1 unit’ (With the 1 changing as the quantity changes)
And the brackets for the price. Which has the duplicated metre change feature from the first part.

Thank you if any one can help me!

add_action( 'woocommerce_before_add_to_cart_quantity', 'display_product_total_amount_html' );
function display_product_total_amount_html() {
    global $product;
    if( ! has_term( array('fabric'), 'product_cat', $product->get_id() ) ) return;
    
    $metres_per_qty  = 0.5;
    $display_price   = wc_get_price_to_display($product);
    $formatted_price = '<span class="price-amount">'. number_format($display_price, 2) . '</span>';

    // Output product total price amount
    $price_string = sprintf( __('Add %s for %s', 'woocommerce'),  
        '<span class="qty-metres">' . $metres_per_qty . ' metre</span>',
        str_replace('0.00', $formatted_price, wc_price(0)) );

    // Output product total price amount
    echo '<div class="total-price_qty" style="margin-bottom:20px;">'.$price_string.'</div>'
    ?>
    <script>
    jQuery(function($){
        $('input[name=quantity]').on( 'input change', function(){
            const qty = $(this).val();
            if ( qty != 0 ) {
                const lengthTxT = qty > 2 ? ' metres' : ' metre';
                $('.total-price_qty .price-amount').html( parseFloat(<?php echo $display_price; ?> * qty).toFixed(2) );
                $('.total-price_qty .qty-metres').html( parseFloat(<?php echo $metres_per_qty; ?> * qty)+lengthTxT );
            }
        });
    });
    </script>
    <?php 
}

I’ve tried to re-code it myself but i keep messing up somewhere!