These items from the education edition appear in the creative inventory

1. Updated to Preview 1.21.50.25
2.  Create a new world in creation
3. Make sure Education Edition is turned on
4. Create a world and join it
5. Open Inventory
6. Click on the button in the third category (the one with the icon of a bed)
7. Scroll down until you find it.

That's why these missing items could be added to Minecraft Bedrock
"minecraft:board"
"minecraft:poster"
"minecraft:portfolio"
"minecraft:camera"
It is expected to add the next Beta Preview