JackBauer117 Hi, I believe this feature is part of the Google Phone app for Pixel 7 and newer models.
This would require installing our Sandboxed Google Play.
Since GrapheneOS does not come with Google apps or services, nor is it included with AOSP's Dialer app, it would not be brought over from the Stock OS.
Side note: we do have a search feature on this forum, and querying for "clear calling" results in a previous solved topic discussion on this matter. See https://discuss.grapheneos.org/d/8361-clear-calling-on-grapheneos