Is your feature request related to a problem? Please describe.

I used to use bettergpt.chat, and it allowed you great control over the raw flow of the chat.
Each chat started with the system prompt at the top, and then you could arbitrarily add messages, where you could choose who they were coming from: system, assistant or user.
This was great for setting up a quick multishot chat.

Describe the solution you'd like
I would really like to have that control in open-webui too.
Editing the system prompt per-chat would be great, but being able to "set up" a chat like that is even more useful.

Describe alternatives you've considered
Keep on using bettergpt.chat, but it's quite limited.