Unable to form JQ as per requirement

I am using JQ Play.

Here is my JSON Data -

{"body":{"primarykey": ["book_id","edition_id"],"members": [    {"name": "book_id","type": "NUMBER"    },    {"name": "edition_id","type": "NUMBER"    },    {"name": "title","type": "VARCHAR2"    }],"links": [    {"rel": "collection","href": "https://tdcvm28s16.bcone.com:7002/ords/testords/metadata-catalog/","mediaType": "application/json"    },    {"rel": "canonical","href": "https://tdcvm28s16.bcone.com:7002/ords/testords/metadata-catalog/books/","mediaType": "application/json"    },    {"rel": "alternate","href": "https://tdcvm28s16.bcone.com:7002/ords/testords/open-api-catalog/books/","mediaType": "application/openapi+json"    },    {"rel": "describes","href": "https://tdcvm28s16.bcone.com:7002/ords/testords/books/"    }]}}

My JQ -

.body.primarykey[] | "{" + . +"}"

Current Output -

"{book_id}""{edition_id}"

My expected output is -

{"book_id"},{"edition_id"}

Here if there are more primary keys, they should also get appended in expected output.

Please help me with correct JQ that will work in jqplay.org