How can i make Upgrade Chests mcbe

Hi,

I want to create a mod for minecraft Bedrock,

all i want to add are Larger chest like Copper chest, iron chest and diamond chest to be able to store more items.

i tried to beginn with adding a normal chest with just a different texture but wasnt able to make any progress.

Unfortunately, I couldnt find a youtube tutorial for this topic either.

I am greatful for every tip :)