const response1 = {
  data: {
    users: [
      {},
      {
        name: 'Oliver',
        surname: 'Max',
      },
    ],
  },
};

const response2 = [
  {
    data: {
      users: [
        {},
        {
          name: 'Oliver',
          surname: 'Max',
        },
      ],
    },
  },
];

const get = (data, path, defaultValue = undefined) => path
  ?.split(/\.|\[|\]|'|"/)
  .filter(Boolean)
  .reduce(
    (acc, key) => (acc = acc?.hasOwnProperty(key)
      ? acc[key]
      : defaultValue),
    data,
  );

console.log(get(response1, 'data.users[1].name', null));
console.log(get(response2, '[0]["data"].users[1].surname', null));