Add attributes to our checkout fields

// Add attributes to our checkout fields
function wc_add_checkout_add_ons_attributes( $checkout_fields ) {
$add_on_id = 2; // change 3 to your add-on id

if ( isset( $checkout_fields['add_ons'][ 'wc_checkout_add_ons_' . $add_on_id ] ) ) {
   $checkout_fields['add_ons'][ 'wc_checkout_add_ons_' . $add_on_id ]['label']   = "<a href='http://your link'>Stext link</a>";
}

$add_on_id = 3; // change 3 to your add-on id

//echo $checkout_fields['add_ons'][ 'wc_checkout_add_ons_' . $add_on_id ];
if ( isset( $checkout_fields['add_ons'][ 'wc_checkout_add_ons_' . $add_on_id ] ) ) {
      $checkout_fields['add_ons'][ 'wc_checkout_add_ons_' . $add_on_id ]['label']   = "<a href='http://your link/'>Label-</a>";
}
$add_on_id = 4; // change 3 to your add-on id
//echo $checkout_fields['add_ons'][ 'wc_checkout_add_ons_' . $add_on_id ];
if ( isset( $checkout_fields['add_ons'][ 'wc_checkout_add_ons_' . $add_on_id ] ) ) {
      $checkout_fields['add_ons'][ 'wc_checkout_add_ons_' . $add_on_id ]['label']   = "<a href='http://yourlink'>Label text-</a>";

}
return $checkout_fields;

}
add_filter( ‘woocommerce_checkout_fields’, ‘wc_add_checkout_add_ons_attributes’, 20 );
*/