Run Shell for Carrier Label

I'm running Dirty Unicorns ROM. It has an option for custom carrier label. When I run shell for "settings list system" the line custom_carrier_label=Verizon Wireless shows. I want to hide all notifications from the lock screen and have my carrier label show %SMS (variable for unread SMS) Message if %SMS>0. My code settings put system custom_carrier_label=%SMS Message in run shell doesn't work. If this is possible what am I doing wrong?

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