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Providing it via the built-in Messaging app is planned but not straightforward to implement since it's not an open platform. GrapheneOS has official support for using RCS via Google Messages rather than it requiring anything sketchy. It's currently essentially the only remaining Android RCS client.

GrapheneOS wants to eventually support RCS in the default chat app. It may take a lot of time for it to work without google components/google services but it is the eventual plan.

> out of the box

Right. Installing Google Messages is not "out of the box" just to clear up the sibling comment as they are a stickler for accuracy. It is not installed by default