So, for multi language site, import custom option should import with different store view, that will be much easier to add products.
Magento 2.2.1 with 3 store view / languages
In product ID 192, the product has a color option with 20 color value, and I have translated it for 3 different store view / languages
In default store view:
In French store view:
In product ID 191, the product has the same custom options like in product 192. I click on import options in Customizable Options in default store view, and import it from product ID 192, then save.
And then, I changed to French store view, the value should be in French as I translated in product ID 192, but all be covered by default value.
And I tried to import it in French store view, but the value also be covered by default value.
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