It can be done with a small code customization. But we see that your website already has these words added before attributes name. Have you already solved this?
I have edited the variable-swatches.php file itself by adding “Select your ” before the php code, this is where i edit your code:
<td class=”label”><label for=”<?php echo sanitize_title( $attribute_name ); ?>”>Select Your <?php echo wc_attribute_label( $attribute_name ); ?></label></td>