Google Home supports this nicely. On my Lenovo Smart Display, I just tried "Hey Google, set a ten second timer and a fifteen second timer" and she did just that.
They also support custom "routines" that you can program. We have a Clever Dripper [1] and use Tom's (of Sweet Maria's) recipe: stir after 90 seconds, drip after 4 minutes (2:30 after the stir). So I created a routine called "coffee timer" that triggers those two timers, and when we pour the hot water into the Clever Dripper we can just say "Hey Google, coffee timer" and it sets both of them.
Actually I put in four variations so we don't have to get the language perfect:
They also support custom "routines" that you can program. We have a Clever Dripper [1] and use Tom's (of Sweet Maria's) recipe: stir after 90 seconds, drip after 4 minutes (2:30 after the stir). So I created a routine called "coffee timer" that triggers those two timers, and when we pour the hot water into the Clever Dripper we can just say "Hey Google, coffee timer" and it sets both of them.
Actually I put in four variations so we don't have to get the language perfect:
"coffee timer"
"coffee timers"
"set coffee timer"
"set coffee timers"
[1] https://www.sweetmarias.com/clever-coffee-dripper-large.html