Simple answer: no. And the warning should include < > characters in the list.
Misunderstood. To a name, no. But for the string itself, yes you can. Not sure why they are not showing in your browser. You should look at the Application State in App Status page (gear icon) to see what value it actually has. For me, it just displays it:
I see the [ ] brackets being saved, but the < > chevrons are not. The reason why I need these characters is for the Pushover driver. I want to use these characters so I can send Pushover HTML-formatted text (e.g., bold and colored defined text).