Is it possible to send previous camera frames to Skia shader for motion extraction?

[MotionProcessing]

Thanks to the collaboration between Skia and Vision Camera, we can put a filter (inverted colors for example) on the live camera. Can we extend this to achieve motion extraction by subtracting the current frame and a color inverted previous frame?

I unsuccessfully tried different ideas involving SkImage<->DrawableFrame conversion, setting uniforms. creating duplicate shader, ShaderBuilder, ImageFilter, etc. I have noticed that there is a Skia.Video but I don't think that is applicable for this problem

Any suggestions are greatly appreciated.

My (least unsuccessful) idea which cannot be executed:

const previousFrame = useSharedValue<SkImage | null>(null);
useEffect(() => {
    return () => {
      if (previousFrame.value) {
        previousFrame.value.dispose();
        previousFrame.value = null;
      }
    };
  }, [previousFrame]);

const frameDiffEffect = Skia.RuntimeEffect.Make(`
    uniform shader currentFrame;
    uniform shader previousFrame;

    half4 main(vec2 pos) {
      vec4 current = currentFrame.eval(pos);
      vec4 previous = previousFrame.eval(pos);
      vec4 diff = abs(current - previous);
      return vec4(diff.rgb, 1.0);
    }
  `);

const shaderBuilder = Skia.RuntimeShaderBuilder(frameDiffEffect as SkRuntimeEffect);
const imageFilter = Skia.ImageFilter.MakeRuntimeShader(shaderBuilder, null, null);
const paint = Skia.Paint();
paint.setImageFilter(imageFilter);

const filterframeProcessor = useSkiaFrameProcessor(
    (frame) => {
      'worklet';
      if (previousFrame.value === null) {
        // TO BE REPLACED WITH THE CORRECT WAY OF STORING CURRENT FRAME
        previousFrame.value = frame.copy();
        return;
      }

      const prevShader = previousFrame.value.makeShader();
      shaderBuilder.setShader('previousFrame', prevShader);
      frame.render(paint);

      previousFrame.value.dispose();
      previousFrame.value = frame.copy();
    },
    [shaderBuilder, paint, previousFrame]
  );