convert string to a string Array in javascript

Sorry , please bare with me , ah I would just like to ask for the terminology and how do we implement or convert a string into something like below. I am not sure if that is string array or something but the output should look like the example.

Thanks for any help and ideas. Appreciated.

let a = 'propertyAccountId';

output = "[\"propertyAccountId\"]"

let b = 'name';
output = "[\"name\"]"

>Solution :

For get the output you desire you could do this:

const b = 'name'
const output = JSON.stringify([b])