The DASH-IF group just finished a work item with the FFMPEG maintainers to build in all the functionality necessary for low latency DASH streaming. The parameters necessary have been documented in the standing "Low Latency Modes for DASH" CR: https://dashif.org/docs/CR-Low-Latency-Live-r8.pdf

Section 9.X.6.3.6 Example: FFmpeg Configuration will give you a full sample command.

Documentation for dash format output: https://ffmpeg.org/ffmpeg-formats.html#dash-2

There is an argument "hls_playlist" documented there that also generates an hls_playlist in addition to the dash manifest. They use the same segment files.