It's supported for SmartThings, but not Hubitat Elevation at this time. You can do it via SmartThings cloud, without owning a ST hub, which is not needed for this. You have to build a Google Home Assistant server. Not hard.
You can do similar with @keithcroshaw 's method.
It can also be done with @ogiewon 's method
and there's @tonesto7 's method.
or another simple option is a Google Home Mini for announcements only. Several methods for that too.
