I have found a "solved" post that may help. Please review the detailed response from our Customer Support Team in the following thread:
Any update on this? Is it still not possible to create an array from PowerApps trigger?
Is it on a backlog somewhere or will it never happen? There are a LOT of people facing this issue.
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Power Platform release plan for the 2021 release wave 2 describes all new features releasing from October 2021 through March 2022.
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