How to insert JSONB types in postgres?

I've looked at https://kysely-org.github.io/kysely/classes/InsertQueryBuilder.html#values and it's not very clear how I'd apply JSON to that column type when inserting. Do I need to create some sort of special helper like in: https://github.com/kysely-org/kysely/blob/master/site/docs/recipes/extending-kysely.md

Also for the interface, do we define the field as a Record type? What if the field is optional?

Oh nice, so just feed in a normal object to the field then

For fetching did you have to implement the extending-kysely.md items?

Thanks