In its current form - never. It's a server add-on and Atlassian are not only not accepting new ones for consideration, they're trying to get rid of the current Server add-ons they do offer.
If the vendor were to write a Connect version, that could go onto Cloud, but it'll be quite different to the current functions you get from the server versions (as Connect add-ons work very differently, there's stuff you simply can't do on Cloud)
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