unless roblox themselves release an api that integrates with livesplit, it’s not really possible
there are some forks of livesplit on github that exist that use image/screen comparisons in order to track splits for games that don’t have an igt/aren’t compatible with livesplit. but those are runner-integrated
the most barebones thing you, the developer can do is have an igt for any time-sensitive activities in your game. anything beyond that imo would be on the shoulders of the src mods for your game to establish rta rules and run verification etc
something else that would help runners set up their livesplit would be a small square that changes color based on the desired split of the activity, for example in something like an obby, the square would be pink for the entrance, red for a climbing section, etc etc