Welcome!
What can I do to be able to save more battery and make using google meet more efficient?
Based on history, that will likely involve convincing Google to create browsers and web pages that are not gluttonous hogs of end-users' resources. They have a problem with that. However there are some things you can check on your computer:
1) Make sure your are running NO anti-virus or so-called "cleaning" software. Both severely interfere with excellent protection for which you paid Apple a shed-load of money to build into macOS. They WILL increase workload and reduce battery runtime. I have worked many threads here where the user, by simply removing this useless fearware, increased runtime from two hours to six hours or more, depending on notebook model.
2) Review any browser add-ons and extensions. Do you really need them? I am running Safari with no AV and no add-ons, and can access any site. Some people collect browser enhancements like my Aunt collects saltshakers!
3) Restart your computer before a meeting. That flushes unused processes that may have launched earlier and are still running in the background.
4) Do an SMC reset. See this article and MAKE CERTAIN you use the instruction set appropriate to your MacBook Pro sub-model:
How to reset the SMC of your Mac - Apple Support
Outside of that, there is not much else to do outside of packing your charger and an extension cord. Google will be Google.
I know naught of ChromeBooks so cannot say why that give longer runtimes.
