How to pass id inside values object in Formik

Question

Am showing firstName, lastName and Role of user on the <select> and <option>. Although those are the values am displaying on the form, I want to assign user.id to assignedTo property before I submit the values. How do I map user.id to assignedTo?

const Common = ({handleSubmit}) => {
 return (
      <Formik
        enableReinitialize
        initialValues={{
          assignedTo: ""
        }}
        validationSchema={FormSchema}
        onSubmit={(values) => {

        handleSubmit(values)
      }}
    >
      {({
          handleChange,
          handleSubmit,
        }) => {
        return (
                  <Form>
                      <Button type="submit">
                        {'Submit'}
                      </Button>

                      <div>
                          <InputLabel
                            htmlFor="assignedTo"
                            className={classes.inputLabel}
                          >
                            {'Assigned To'}
                          </InputLabel>

                            <select
                              onChange={handleChange}
                              name="assignedTo"
                              value={values.assignedTo}
                            >
                              <option value={values.assignedTo} selected>
                                {values.assignedTo}
                              </option>
                              {userData
                                .map((user) => (
                                  <option
                                    value={
                                      `${user.firstName} 
                                       ${user.lastName} 
                                       (${user.role.description})`
                                     }
                                    key={user.id}>
                                    {
                                      `${user.firstName}
                                       ${user.lastName}
                                       (${user.role.description})
                                      `
                                    }
                                  </option>
                                ))}
                            </select>
                            </div>
                  </Form>
        );
      }}
    </Formik>
);
};