Variation percentage price calculated on basic price Woocommerce

I am going to have a lot of products on my shop and each going to have multiple variations.
I would like to make a solution which will calculate regular price for variation based on basic price.

So for example on the first picture there could be an input for basic price
basic price location example

On the picture below you can see normal variation edit and here I would like to get input. In that input I enter for example 120% and regular price for variation changes to $120 from $100
enter image description here

Do you know how to do this?
Unfortunatelly I don’t know how to start so can’t say what I tried and I hope some of you will give me even some advices

Thank you in advance