Remove solder mask over trace

I’m trying to make a guard trace around an op amp’s in+ pin.

The datasheet says “Solder mask should not cover the input and the guard area including guard traces on either side of the PCB.”

I have looked around in the editor and haven’t found a way to remove the solder mask from specific traces or parts of the board. I assume there is a way and I just haven’t figured it out. I have played around with the keepout and mask layer, but they seem to be the opposite of what I want. Any suggestions in the right direction would be appreciated.

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