The COVID- 19 form is based on the Contact object.
See the sample file with the data model based on the Contact object and the interactive collection with Signature record
Create the data model.
Create Interactive Collection.
You can now open the Designer and made any changes you wish to implement, save the form, and publish it.
You can generate it manually from the generation screen and the form will be sent to selected recipients.
You can also proceed to the automation step.