Add to the current price of massively loaded products vat 2

Hello,
I could use a little information.
I have set up in my site that I will upload the prices of products excluding vat, and then the customer will see them with vat including 22%.
So I upload product A at 5€ the customer currently sees it at 6.1€.

Now I would like to set up woocommerce and say that I will load the products with vat included!
So I load product A at 6.1€ the customer currently sees it at 6.1€ (because I included vat in the price)

For all the previous products where I had instead loaded prices excluding vat is there a massive method to get them changed
Thanks