How can I integrate my custom module with venia theme (pwa-studio)

Question

I want to integration venia theme (pwa) and my custom module. But I can't find any documentation for this. No examples. No integration point in the code. Nothing.

Only https://github.com/Jordaneisenburger/fallback-studio

I had no clue on how or where to start building my own storefront.

But I find many vue storefront module example

https://github.com/DivanteLtd/vue-storefront/blob/master/docs/guide/modules/introduction.md

https://github.com/frqnck/awesome-vue-storefront#front-end-modules

How can I fluently add custom react component at the product page after description for example?

How can I run GraphQL query?

p.s. Which to use venia or vue storefront?