How to use auto exposure's value to set my cine camera's manual exposure with blueprint?

Hi! i’m making an animation using sequencer.
my shot is planed to be auto exposure and i set the main camera as auto exposure.

but my result should be very high resolution so i’m using highresolution tiling rendering in Movie Render Que.

since it does not supporting auto exposure(exposure differences can be happen in tiling rendering with auto exposurer)

i come up with the idea that build and my blueprint that my manual exposure camera following my post processing volume’s auto exposure so that my tiling rendering can take exposure consistance and still camera be auto exposure.

so i made a simple BP code but it seems like Exposure compensation is not represent the compensation of ‘autoexposure’. the value of exposure compensation constantly value of 1 even the lights are change

is there any good solution for auto exposure following BP?