Probably you should gonna take a deep look into streamlabs dashboard or streamelements dashboard (you need to connect your twitch account onto these sites), in order to create your own layout for your streams (alerts, chat, donation goal, and another kinda fun widgets).
For timers of your on-going gameplays, you have wsplit or livesplit
. (As an speedrunner, I use livesplit and most streamers/speedrunners use this last one).
Hope this info helps you.