Wocoomerce Membership functions return with undefined in any of my child template file

Question

I would like to try using the function below in my content-product.php within my child theme
wc_memberships_get_product_membership_plans(). But every time I added this, it always return with undefined function wc_memberships_get_product_membership_plans()?

Is there anything I need to do prior to using this? My WooCommerce membership is active.

I have tried to add it to functions.php and to content-product.php, but nothing works