Custom Provider Api Key

From looking at the current documentation, it seems like it's not yet possible to add a fully custom provider by specifying your own base URL, a custom provider name, and your own API key or is there actually a way to do it?

If it's not supported yet, do you plan to add this feature in an upcoming update? I noticed that the latest OpenClaw changelog already mentions support for this kind of custom provider configuration (custom base URL, name, and API key).