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