Having SpaceFn and normal space with Karabiner?

I got SpaceFn to work by following this rule: "Space enables SpaceFN mode (see: https://geekhack.org/index.php?topic=51069.0) ". But I also want to assign normal space bar to another key (for long press to unmute in Zoom calls). I can't do that because all space key become SpaceFn. So can I have both normal space key and SpaceFn key at the same time?