Can you make the storage readable via interface or other block by another mod like LgisticPipe (Provider Piepe).
Like the external storage but in the opposite direction.

• Minecraft:1.12.2

https://www.curseforge.com/minecraft/mc-mods/logistics-bridge

Ok but in the modpack I'm playing there isn't it.
Anyway if I want to use RS with Project Red transportation?

You can export items with an exporter or interface and interact with those. Any other ways would need an addon mod like the one I posted above.

Ok but i don't think there is an addonn for every mod and the exporter has a limited ammount of Item that it can export