How can I wait x seconds each time and use loopindex in a loop

In the for-loop event, we can use wait 0.1 * loopindex seconds to wait for 0.1 second in each loop.

However, when I try to use loopindex at the same time, it is reset to 0. it is not a static variable in this scope.

The result is failure:

The current solution is to add a static variable to record it. But I think this is very troublesome.

I'm wondering if there is a more elegant way to do it?