'FFMPEG how to increase the volume of copied audio?

I‘m combining video A.mp4 and B.mp4, producing video C.mp4, using A.mp4's audio:

                ffmpeg \
                -i  A.mp4 \
                -i B.mp4 \
                -filter_complex "[0:v]pad=iw*2:ih[v_wide];[v_wide][1:v]overlay=W/2:0[out_video]" \
                -map "[out_video]" \
                -c:v libx265 \
                -crf 28 \
                -map 0:a:0 \
                -c:a copy -y \
                ./C.mp4

But due to some reason, the audio of A.mp4 is too quiet, so I use the following procedure to increase its DB:

        ffmpeg -i C.mp4 -af volume=20dB -c:v libx265 C_high_volume.mp4

The question is, can I combine the two steps into one (i.e. increasing the audio volume while coping it to C.mp4) so that I can save some processing time?

videoffmpeg


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