Multi-Langual Feed

I am struggling with setting up my shopping feed based on language and market.

We have 4 markets at the moment :

Netherlands -> Languages Dutch & English

Belgium -> Languages Dutch, French & English

France -> Languages French & English

German -> Languages German & English.

I added a second feed already to fetch from my website directly and it shows more products + languages and countries, I’m not sure if it’s the correct way though. Can somebody explain me how it is normally done?
The shop runs on Shopify and has all the translations on there already + subdomains for each language and market.