The tracepoints window includes instructions for several special keywords, the most useful by far being $CALLSTACK:

These are not all there are – two more exist: $TICK and $FILEPOS. Quoting the documentation:

$TICK inserts the current CPU tick count, while $FILEPOS inserts the current file position.

$TICK displays a time counter in hex, but otherwise both work as advertised and are documented and official. There is just a good chance nobody knows them, since –reasonably – no one thought of going on MSDN to dig them out, as the dialog itself goes unusually deep into details.