Machform webform checkboxes integration with Service Now - no values- Raw JSON

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I have successfully integrated Machforms with Service Now, however, I cannot seem to get the values from Checkboxes to come through.

My setup is:

HTTP POST

HTTP UserName : xxxx

HTTP PW: xxxx

Headers - "Content-Type": "application/json"

The checkboxes in Machform use a single element (merge) tag {element_1), however in the database, the different values are:

(element_1_1} - for checkbox 1

{element_1-2} - for checkbox 2

{element_1_3} - for checkbox 3

I have tried using this RAW JSON format

"[{element_1_1}{element_1_2}{element_1_3}]"

and

"[{element_1}]"

and

"{element_1}"

The values come out as {element_1} , instead of the actual value.

This is my only issue