On trigger configuration, at trigger constructor, today we have the option "test", were we can fill the values of each expression for test.
However, this is very, very useless and inefficient.
When we want to test an expression, we want to get real values in the current moment or at some time in the past to reproduce and understand situations to adjust our triggers in better way.

The idea is add a field + button on top.

Field to put the time shift , like "now" , "now -1h" , "2024-06-05 23:55"
+button get values, were will calculate each expression considering the time shift set and fill the fields with them.