How to add draw offer to PGN?

Question

Does PGN have any annotation for draw offer? Just adding = after a move doesn't seem to work everywhere.

Among the standard NAGs there's $10 (drawish position or even) which translate as = or I can use comment, but wondering whether there's a specific way of adding a draw offer.

Answer 1

There is no symbol for a draw offer. Just add a comment {draw offered}