Genuine conditional fields are in our development plans, but have not been implemented yet.
However, it is possible to implement a custom field that will behave in a similar way using the TextBeforeIfNotEmpty and TextAfterIfNotEmpty properties of MergeFields
. By default they are not added if the field value is empty string. In the attached sample implementation they are added if the value is not 0. Please find the project attached.
Let us know if you need additional assistance.