Change Quality Labels from resolution to bitrate

Hello all, We have an adaptive stream at 720p at three different bitrates (500, 800, 2000 kbps). On the quality selector, we'd like to show the bitrate instead of the resolution, as it only ends up showing three options of 720p. Does anyone have experience in changing these labels? I looked at https://support.jwplayer.com/customer/portal/articles/1428524, but our challenge is that the stream is adaptive and thus we have one stream URL for all three options -- we can't define each one individually and set the labels ourselves. Thank you!