Can we add a flexfield to the candidate profile?

I have been asked by our TA Team if we can add a flex field for notes or other details that we want to add to the candidate profile?

I was looking through the implementation guide and see EFFs for the application flows. But nothing to allow us to add a flexfield on the candidate profile.

It was suggested to me from a consultant that the recruiter utilize "Send Message to Team" and send it to themself, and can view the information on the Interactions tab. But when I shared that with the team, I was told that was "too many clicks" - even when I suggested we use a template and they add in the detail(s) they want to add.