How to set PARAM variable inside JSON Data?

Hey guys, hope everyone is doing fine :sunny:

have setup server side API like so

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with a Hasura Endpoint as you can clearly see… the thing is that I’m trying to add a $_PARAM or $_POST variable value into the JSON Data specified and shown there… I’m trying to do it this way and it’s not working:

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Any idea how will I be able to connect my variable to a JSON Data?

here is the JSON data::

{
  "query": "mutation vote { update_candidatos(_inc: {votos: 1}, where: {id: {_eq: {{$_POST.candidateid}}}}) { returning { id votos partido_politico nombre image_url}}}"
}

And also, this is how I’m sending the data client side:

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