Excellent plugin!!!!, but I have a question

The plugin is wonderful for me, but I am using a plugin called Role and Customer Based Pricing for WooCommerce and that plugin saves a metadata and that I was already able to obtain in this plugin, but the value that it returns looks like this:
{“Reseller”:{“pricing_type”:”flat”,”regular_price”:50,”sale_price”:null,”discount”:null,”minimum”:null,”maximum”:null,”group_of”:null, “product_id”:null}}

So I want to know if there is any way to get to the “regular_price” option. In the same way, I would like to know if you can do some mathematical operation between two selected fields and show it in any custom field