Is there a way to hide a new custom body field on existing custom forms when it is deployed via sdf-cli for nodejs?

I think if you just deleted its definition in the object file, it will be removed. If you want to just hide it, you will need to check the xml tag or value that can do that.

Sorry, that lacked context. In SuiteBundler if we deploy a field that is new to the account, we have the option to hide it in existing custom forms. Is there an equivalent for SDF?