Any way to rename roles (user/assistant) in the new llama-server UI?

[MoonRide303]

Old UI llama-server allowed easy renaming user/assistant, and it was often one of the easiest and fastest way to enable new personalities for many models (supplementing and more efficient than system message alone).

Example (with old llama-server): Llama 3 8B Instruct, "Just be yourself, to the core." system message, first using "assistant", then "grok" role for the model responses:

Is there any way to do something like that with the new llama-server UI? I noticed Advanced config in the Settings and looked at the documentation of it, but I didn't notice any setting that could change user and/or assistant role name.