Thank you for contacting Hand2Note support.
You can create the necessary stats and define Position for a player or villain as straddle in Action Detail on Preflop in Stats Editor:
Some examples of such stats you can find in our PokerMasterDefaultPopup:
If your config does not have this Popup, then you need to reinstall Hand2Note.
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Straddle is fully supported and it's treated as a third blind.