It depends on what version of ACF you are using. If you are using ACF5, then yes, you can include only a single field of a group and it’s in the documentation https://www.advancedcustomfields.com/resources/acf_form/. See the option fields
ACF4 does not have this capability and it cannot be done. You would need to create a field group with only one field to do it in ACF4. https://www.advancedcustomfields.com/resources/acf_form/?version=4
