Why not this idea?

When you click on item it should appear a modal window, here is the link: https://codepen.io/Metis/pen/mjryoz?editors=1010
P. S not clear it doesn't seem to object and array, and in theory there should be all reactive.......
June 3rd 19 at 21:05
1 answer
June 3rd 19 at 21:07
Changes to array elements are not tracked... so replace
shower[index] = !shower[index]
$set(shower, index !shower[index])

Better yet - get an array of shower and add elements to the items property show - then it will work as you want. Type so.

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