You could take a look into create multiple fields that hide/show based the value from the dropdown.
- dropdown selection with the different values
- checkbox for bool
- text for text
- int for numeric value
- ... etc.
this does not require any customization or custom development. But might be a bit messy to keep track of the different options and such, and you have a lot of different fields. You would also need to implement the same logic when using the data.
A much cleaner solution would be to create a custom control that would handle all validation and the different controls but still store it in one field. You can make it as dynamic and flexible you like.
some info in the docs: docs.xperience.io/.../example-developing-custom-form-controls