Currently, we have the hlsmultivariantsink plugin, which generates a master HLS playlist as well as playlists for the individual streams (variants). However, if you want to generate a DASH stream, there is no equivalent to hlsmultivariantsink. You are forced to use dashmp4mux and implement the manifest logic yourself. Moreover, if you wanna generate a CMAF-compliant stream (i.e., generate .mpd and .m3u8 playlists together), since there is no element that would handle generating a DASH playlist, you are in the same situation as when generating a DASH stream.
The way I see it, there should be a plugin that would handle both generating HLS and DASH streams. Would the community be interested in a plugin that would handle both cases?