Lucid and Postgres: Merge a JSON/JSONB column on update

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Is there a way to merge a jsonb column with Lucid when an update is executed?

example: User table has a column details (json) when a user is created this column is populated with {first_name:"xxx", last_name:"xxx"}

Now I want a user to upload a profile picture, and append an avatar to the details column, resulting in
{first_name:"xxx", last_name:"xxx", avatar:"path/to/image"}

Also, I want the user to update his first_name and last_name without losing the previously uploaded avatar, by just sending {"first_name": "bbb", "last_name": "ccc"} via body.

I know I can merge all this manually within the controller, but is there an alternative way to do it with User.query().where(...).update(...) only?