is it possible to input filters generated by REW manually into my AVR?
REW filters are Equalizer model specific. Each type of equalizer defines bandwidth differently. This math is programmed into REW when the type is selected. The filters are variable center frequency, bandwidth and gain. That's what a parametric EQ does - an AVR isn't up to the task I'm afraid.
Note: The floppy icon in the lower left hand portion of an REW graph saves a jpg of the graph of 800 bits wide suitable for posting - you don't need to post the entire page.
Also note that for subwoofer plots, always use the standard Vertical graph axis of (45dB - 105dB) and the Horizontal graph axis of (15Hz - 200Hz) using the Graph Limits button in the top right corner of REW. Use a measurement start frequency of 0Hz and an end frequency of 200Hz. Use the appropriate target line that matches your crossover.
For full range plots, use the standard Vertical graph axis of (45dB - 105dB) and the Horizontal graph axis of (15Hz - upper limits) you desire, i.e. 15KHz -20KHz. Use a full range target line.
For full range only, enable smoothing (1/3 octave) to eliminate the comb filtering.
brucek