This tweak is only compatible with iOS 13.

Change InCallUI to Call Bubble in Android Google Dialer. (XDA-Developers)

Feature:

• If you receive a call, Android's incoming call notification is displayed instead of InCallUI on iOS.
• When you slide up CallBubble's Incoming Call UI, incoming call will decline.
• When you receive a call using CallBubble's Incoming Call UI, Call Bubble is displayed. Call Bubble allows you to return to the phone, switch speaker or mute microphone, or end the call.