gokuquarto FYI: Skvalex in combination with Shizuku works fine on a pixel 10 Pro w/ current GrapheneOS. I use voice uplink+ voice downlink.
It records calls over Bluetooth and my SIP client as well as WhatsApp (uncheck "Ignore VOIP calls" for that).
You do need to get a license outside of the play store at https://callrecorder.skvalex.com/get (normal site for docs is .org FYI)
Cube ACR recorder pro records Signal automatically too for some reason :)
So with the two every call I make or take is recorded in good quality (as in: ambient noise is suppressed, it's a clear audio stream of the call).