Is there a simple way to know how many rows are in a wrapped Flexbox?

I want to color stripe each row inside a multi-row flexbox

.container{     display:flex;    flex-flow: row wrap;}

Has anyone discovered a simple way to determine the row count of a flexbox?

I looked at this question that did not accomplish the striping, but instead "manually" marks the Html element in order to stripe: Zebra striping a flexbox table with wrapping items

I looked at this question which accomplishes the task by programmatically calculating the row-breaks in JavaScript. It counts the number of different getBoundingClientRect.top in the container: zebra striping rows in a flex container with flex-wrap:wrap

I don't mind the JS, but, unfortunately, this solution also requires watching for changes in both the page layout and the content of each wrapped item inside the container.

Does anyone have a solution that doesn't require "manually" monitoring the layout and content?