Have you heard of https://dokie.li/ ?

It's a client based decentrliased editor for annotations by the solid people (https://solidproject.org/TR/2022/protocol-20221231)

There are many interesting parallels between what's going on here:

"The aims of the Solid project are in line with those of the Web itself: empowerment towards "an equitable, informed and interconnected society". Solid adds to existing Web standards to realise a space where individuals can maintain their autonomy, control their data and privacy, and choose applications and services to fulfil their needs."