we suggest modifying the grid data based on the below faq

https://redq.gitbooks.io/reactive-pro-advance-searching-filtering/content/faq.html

49) How to show shortcode in grid template?

instead of shortcode, you can return any data and that can be your product range price, after that just use that price on your shop page.

NB: with Reactivepro version 4.0.9 you can use apply filter hooks to modify data. To know about hooks check the hooks.md file inside the plugin or contact with the support team.