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    Please create a minimal reproducible example. What is app.id? What does items and "the second array" look like and how are they connected? Commented Feb 8, 2023 at 14:43
  • You need to first filter for the selected app. Then you can create a map where you destructure the app to retain existing properties, then set the selectedItems array for each app. You can go a step further and flatten that result if necessary. Provided an answer with a snippet. Commented Feb 10, 2023 at 17:35