upgrade price not down it

Hello
I would like to add a “%” at the original price and not lower it.
ex: 100 € + 30% (customer) = price displayed: 130 €
this is possible with your plugin?

if not, how can I implement. in your code, it is not possible to say adding instead of removing?

https://www.ads-software.com/plugins/woocommerce-role-pricing/