I haven’t gotten around to adding the ability to store pictures yet or some other features. But this extensions is slightly similar if you use standard notes already for encrypted notes, this extension I created awhile ago might help from a privacy standpoint for those concerned. Also those who are concerned about a product going away/longevity, everything is plain JSON formatted text. (I.e why I created it).
https://github.com/tryonlinux/Home-Inventory-sn
disclaimer: Not trying to take away from this product, as I feel it definitely serves a purpose and market that my extension doesn’t cover and vice versa.