Indexing into Data Structures

Hi everyone!

So this is a concept I am quite comfortable with in traditional programming, but am struggling with it in Wappler. I am sure it comes down to just not knowing the proper syntax so I’m calling in a lifeline!

I am inside of a repeat and need to build off of some previous values, with each iteration building off prior values (to achieve a “smoothing effect” in this particular metric). In the screenshot below, the gain_avg in object 15 is going to be based off of the gain_avg value in the previous object $14.gain_avg value.

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I can successfully decrement the index using this notation {{$index-1}} but how do I get to the gain_avg property belonging to this object? {{$index-1.gain_avg}} and {{($index-1)gain_avg}} don’t work.