I want to propose, but my gf doesn’t want an engagement ring. What should I do?

My girlfriend only wants to have a wedding band and no engagement ring.

I still would like to formally propose, but I do not know what to do. She hasn’t expressed any desires around being proposed to so I am kind of lost (other than it being private).

Should I still get on one knee and just hold her hand? Has anyone else proposed without a ring?