Hi, I also do face this problem sometimes, and i come out with another approach

const oldData = {
 manual_timezone: ‘GMT (+5.30)’,
 role: ‘Admin’,
 isDisabled: true
};
const uiFormData = {
 role: ‘your_newRole’,
 isDisabled: false
};

let newData = {
  ...oldData,
  ...uiFormData
} // or you can use Object.assign(...)

this will let uiFormData to merge with oldData you get from api.