You can measure anything as a KPI! Not sure if you're referring to a particular standard clause but this is what we are using in my company.
Ironically- we are measuring as a KPI, our progress in implementing KPI's

(see attached, I've removed any sensitive information).
On the front sheet we've said what the task is that we need to do- to achieve our goal (this is based on a strategy we've completed for Quality).
Then on the other sheets we've broken our goals into smaller tasks and we're basing our KPI's on the target date for completion and the actual date and also the % completed.
So if awareness is your goal, your front sheet might say "Awareness around XYZ" and break it down into employee names and awareness steps. So, maybe training and the % target of employees trained for the business year, etc.
Another step of your plan might be, "poster campaign" and again a target month for the business year and % completed. Wala, a KPI is born.
Not sure if this helps (hopefully it does)- there's also other threads on how people have implemented awareness in their places of work.