How to run Rule Set Automatically on Screen?

I am trying to run my Rule Set Automatically on Screen but I can not find any option how to do it. I need to run Rule Set after opening a Screen immediately for each row. Now my Rule Set run just after editing a collum.

Thanks for any ideas.

This is actually the design. In order to speed things up we do not want to bother the user by recalculation when a form is open. It already takes enough time to load and render data on screen. So it is granted that data in the database are already calculated correctly. Now it is only needed to recalculate on data change.

But maybe there is another solution. What is your use case?

I have a Virtual field in my Entity + Database fields. For example I want to calculate final prize for item from database(add a Tax…) and save the result to the virtual field.