Using with Rockchip ffmpeg

I am interested how `fluent-ffmpeg` properly extracts available HW-accelerated codecs & filters from rockchip ffmpeg

> https://github.com/fluent-ffmpeg/node-fluent-ffmpeg#querying-ffmpeg-capabilities

> https://github.com/hbiyik/ffmpeg-rockchip/wiki/Filter

> https://github.com/hbiyik/ffmpeg-rockchip/wiki/Encoder

I am unable to do so & it states codec `h264_rkmpp` not available thought it is