I want to use a hidden question on the form but unfortunately using a calculation type will need a required calculation, the goal is from an external app i passed a hidden value like customerId to ODK Collect Form.
Hmm, I don't think calculates are required. But, if you do use an external app, that question will have to have an visible button on screen. https://docs.opendatakit.org/launch-apps-from-collect/ has more.