Very few options, and they are going to be pretty hacky.
- SHARP TOOLS If you have an android phone that can run the app, then the most promising would be to use some combination of Tasker and sharptools (both third-party apps) to essentially automate the operation of the app. This won’t work with an iPhone, though.
(SharpTools has a dashboard product which is a competitor to action tiles, but in this case, what you are looking for is the rules engine, a different feature.)
@joshua_lyon is the developer of sharp tools and is very active in this forum, so he may be able to say more about what is possible.
- Automating Spoken Commands
It may be possible to set up a second smart speaker so that it can literally say the commands to the other Google speaker and automate some integration that way.
This is quite easy to do with an echo device, because you can create a routine to make it say whatever you want it to and then automate that routine. I just don’t know if you can do something similar with the Google assistant yet, the last time I looked you couldn’t.
So worst case would be to set up an Echo Dot and have it speak the commands to your Google home,
( I said this was hacky, remember? But it does work. 
. )
Or if you have an old android phone, you could also use that as a text to speech device, same idea.
Here’s the FAQ on the echo approach, it will give you the idea. Again though it’s dependent on features which are specifically available for the echo, so in the end your set pup might be a bit different. But the same idea.