New Column Type (and action): Merging Arrays

I need a new computed column type: Merge array.
For example, I have a lookup containing two arrays like this:
[{1}]
[{2},{3}]

I want to merge them into:
[{1},{2},{3}]

I know I can do that with JS easily. But I think it should be native!

And I know there is the append array. But, my use case doesn’t allow me to do that. I can’t predict how many array there will be in my lookup result.

So your lookup is returning an array of JSON arrays?

Exactly.

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