How do I add a Google Assistant command to a button on the homescreen? I'd like to add a widget/shortcut/whatever to the home screen that would allow me to execute a google assistant command as if I had said it.

For example, "Turn off the Livingroom TV".

This would be extremely useful, as it would allow me to dedicate a page in my launcher to home automation tasks. Sometimes it's not reasonable to use my voice (baby on lap for example) and while I'm aware I can hold the home button then click the keyboard icon, I was hoping there was a quicker/easier way.

Although I'd prefer a general answer, I'm using an LG V30+, running Android 8.0.0 if you have any more specific ideas.
Since asking this question, Google has release an app called Action Blocks which does literally exactly what I'm asking for in this question.

With it, you can create "actions" which are either from one of the predefined examples or you can type in arbitrary text which would be parsed as if you typed (or said) it into google assistant directly. These actions can be attached to the homescreen as widgets.

It's not the fastest application in the world, and it's still a bit buggy at time of writing, but it's also only about a week old so I imagine it'll get more solid over time.