how to set a 'Teams' Theme and 'strong' scheme on v8 ThemeProvider

Question

I am using ThemeProvider in my app by importing ThemeProvider from '@fluentui/react-theme-provider';

I want to be able to set the app theme to be 'Teams' Theme and the Scheme to be 'strong', like you can see in the documentation here:

https://fabricweb.z5.web.core.windows.net/oufr/8.0.0-beta.2/#/examples/themeprovider#Variants

In those examples you can select a Theme and a Scheme. But I don't see in the code for those how the Theme and Scheme are being set.
Can the documentation be updated to show how to set the Theme and the Scheme for the ThemeProvider?