how could i add an additional single hash to a line i ($i) of my array of hashes
Do you mean: how can I add an extra key-value pair to one of the hashes in my AoH?
Assuming you do, like this:
$Array[ $i ]{ newKey } = 'newValue'.
Once the reference is shared (or is a reference to a shared hash--same thing), adding pairs is just the same as normal. Because scalars, (keys and values) are shared by value. Only references are shared by reference.
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