Use Field Label in Schema?

Besides adding additional schema filters and grabbing a custom field value, can you also grab the custom field label to use for the output of your schema filter?

So instead of doing this:

$schema['priceRange'] = get_post_meta( $postId, 'biz-price-range', true );

Can you grab the label meta_key from the custom field type and output that instead of the value with the code above?