This is the documentation for ConfiForms Server/Data Center appHowever, this might also work for ConfiForms cloud and in most cases it does. But please see this page to understand the differences between server and cloud versions of the ConfiForms app.
Each and every record in ConfiForms has set of metadata fields that are there automatically and managed for you by ConfiForms
These fields could be queries the same way as you do with other, user defined fields.
To access and id (or UUID of the record) you can use the following methods
Using [entry.field_name] notation
Or by Using ConfiForms Field macro, setting "Field name" parameter as follows