Hi and hope this finds you well, PostgreSQL has state of the art JSON(B) data type and query support, and basic updates as well, eg jsonb_set().
How about enabling users to do more advanced processing of JSON data inside the database itself, using JavaScript? There's the PLV8 extension https://github.com/plv8/plv8 but it's not available for many major db providers (eg Heroku), making it hard to adopt it. Having it supported in the standard PostgreSQL distribution, besides the existing 4 languages ( https://www.postgresql.org/docs/12/xplang.html), would be awesome! Would you kindly consider this? Thanks & stay safe, Marius