Change check box value to boolean

Hi there, I’ve almost got this working (sending to 3rd party API, not Zapier although I am testing with Zapier) but I’m having trouble with a checkbox:

[checkbox consentToFollowUp use_label_element “I would like a follow-up with a representative|true”]

I would like it to return the value:

consentToFollowUp: true
(or false if unchecked i.e. boolean)

But it seems to be saving an array:

consentToFollowUp:
1: true

Can I add a filter to fix this.

Thank you ??