Here on the image you can see that I can put portable storages from other mods:
Sack (Supplementaries), Toolbox (Create), Luggage (Luggage), Bundle (Minecraft)

Can you add config option to blacklist items from shulker box by item id and item tag?

there are already config options for that disallowedItems and containerItemsDisallowed

Oh, I see, it is located in Server Config, not that obvious. Thank you!