Create DM-only features of a character sheet.

Hello, I'm making a custom character sheet. There are certain parts of the character sheet that I would like to hide from the players, but that I would still like to access as a DM. I'm pretty sure I remember reading somewhere on the wiki that it's possible for the sheet to display differently to players and DMs, but I've looked and can't seem to find how. Can anyone point me in the right direction? Thank you in advance.

Upon some more searching I found the playerIsGM() utility function in the API. I'm starting to think that maybe that's the thing I remember reading earlier. I could at least probably make a work-around using the API, but I'm still wondering if it's possible to do this using just the character sheet and/or sheetworkers?