How to use webhooks to send more than one image to another doc

After seeing this post Ingesting an expirable Image URL doesn't work? solved by @Scott_Collier-Weir (thank you, Scott) I realized that I could use webhooks to send pictures hosted in Coda to another Doc using the hidden formula _Deref_Object(_Merge(, "publicUrl") that I learned from @Paul_Danyliuk (thank you, Paul).
Instead of sending the picture itself, I would send its URL.
It’s easy to use webhooks to send more than one URL of pictures using the formula below:

    _Deref_Object(_Merge(CurrentValue), "publicUrl")

But I just can pass more than one image URL to a image column. This formula bellow doesn’t work:


Any help on this will be appreciated. Thank you

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