Automation with symbols


Is there any way to create a workflow to change symbols?

I want a "high priority"exclamation point to show up in a symbols column anytime "last modified" is not in the last 7 days. I see I can change cell value using text and drop downs, but there is no option for symbols.

Is it's not possible to change a symbols column using workflow, can someone provide me with an IF statement that would allow for this to happen?

Thank you

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