delay scale parameter from the shape layer repeater

Hi,

I want to animate the scale parameter of the repeater effect and delay it on several shapes.

I've tried with this expression using 2 expressions sliders but without success

thisIndex=thisProperty.propertyGroup(3).propertyIndex;

effet=effect("repetition echelle")("Curseur");

delai=effect("delai")("Curseur")*thisComp.frameDuration*(thisIndex - 1);

[effet.valueAtTime(time - d),effet.valueAtTime(time - d)]

I've searched through the web but didn't find anything about it and I'm wondering if it's even possible

Any clue ?