Try to parse with `pyUtils`.

it provided some convience function for converting python-like data to js-like.

Search py_eval() / pyeval() in Odoo u should find some examples.

var pyUtils = require('web.py_utils')

// pass some custom options from xml to js
_testFunction: function () {   
    var options = pyUtils.py_eval(node.attrs.options)
}

JS Parse replace single quote to double quote globally.

var res = JSON.parse(object.replace(/'/g, '"'));

console.log("city", res.city);

https://stackoverflow.com/questions/36038454/parsing-string-as-json-with-single-quotes