Hi Felix Rabinovich,
I am just suggesting some ideas try it .
1.click that field go to events session
2.generate a new microflow on on-leave session
3.In that microflow ,first check a condition whether the test group is empty or not .
4.if it is empty just end it else, attach show a page activity in it and select the page to be showed
5.In that page ,add a list or grid of that selected entity then add a xpath condition so that the selected test details will be showed