How to add new registration fields for customers in Magento 2 Mobile app?

You can use Magento 2 Custom Registration Fields to add new registration fields for customers in Magento 2. Using this extension, the admin can extend his website’s customer sign-up form thus enabling the admin to capture more useful information from the customer apart from the default ones that are available on the sign-up form.

Once you have the feature on Magento it can be integrated into Magento 2 Mobile app through customization. For this, you can contact us by creating a ticket.