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Creating an ambilight effect requires you to have something that can read the screen to determine what lights to show, so that basically requires decoding and processing a video stream in real time which is beyond the capabilities of most typical MCU's like those used for WLED. There is a project called Hyperion but that requires a full Raspberry Pi and a USB HDMI capture card. There are lots of tutorials for this on YouTube
https://github.com/abrenoch/Hyperion-Android-grabber I believe. You would need to run Hyperion on different hardware probably though from the look of it.