Adding homebrew items/perks to character sheet?

Heyy, currently playing fallout 2d20 on roll20 and have been supplementing the lack of additional source material available on that platform by just adding the items/perks from the different books in manually. It seems like that’s not an option on Demiplane? like you can only add items from the compendium.

I really like the design of the Demiplane character sheets over the roll20 ones, but until I can get all my stuff on there then I probably won’t be using it