POST or PUT request with an array of data

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1

On one of my WeWeb pages, I am have a group bound to an array of items coming in via a GET request. This array is a repeating list of data set as the init value for an input box

{
    "data": [
        {"foo": "bar"},
        {"foo": "baz"},
        {"foo": "qux"}
    ]
}

What I’m struggling to figure out, is to now send that data back in a JSON object via a PUT request. The input element the original data is bound to as an init value isn’t available in the formula builder as one of the page components. This is set up as an interactive form, so a user might click on the page with a list of elements already created, and now needs to add one element to that list and save it.