Here’s a concise yet informative text you can use:
Traditional PGN (Portable Game Notation) records chess games in a standardized format: event, site, date, round, players, result, and the move list. A holistic PGN expands this concept by treating the game as more than a sequence of moves.
Ultimately, holistic PGN transforms a dry record of moves into a living, teachable, and reflective chess document.