Use patternProperties
{ "$schema": "http://json-schema.org/draft-6/schema#", "type": "object", "properties": { "shipping_address": { "patternProperties": { "^.*$": { "properties": { "haha":{ "type":"integer" } } } } } } }

You can try something like this:
{ "id": "my-schema", "type": "object", "properties": { "objects": { "type": "object", "patternProperties": { "[a-z]+": { "type": "object", "properties": { "id": { "type": "integer" }, "name": { "type": "string" } }, "additionalProperties": false, "required": [ "id", "name" ] } } } } }