'How to send POST method with quotation marked key data?

I found out that Request Payload object's key is without quotation mark like below.

But I want to send a request with quotation marked key object. Because bellow way didn't occur a error to me.

I'm sending data like follow

{
   data: JSON.stringify({account: '0x555~~'})
}

Solution 1:^[1]

Whatever you already did must work properly.Since it's not

Just try sending it like this

let account = '0x555....'
data.JSON.stringify({account})

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Solution	Source
Solution 1	Sharan Balakrishnan