import publications from a json file

We are using Biblio module for publications. We are trying to import publications from one of our in-house website into drupal. We extracted all publications from the in-house application into a JSON file. Below is a sample of JSON record.

We are not able to see author fields in the target field mappings. The settings for feeds are :
Node processor Bundle *
Biblio
Parser type is JSONPath parser

To test, we tried mapping title, year and doi. Title and year import successfully but doi does not. We are unable to find authors in the target. Any ideas on bulk import? We have already spent many hours figuring out the issue but no luck.

I am wondering if this is a bug or if Biblio supports bulk imports and/or if we are following the right approach?

[{"id":"555","bibTex":"PPKM15","entry":"Article","address":"","booktitle":"","chapter":null,"edition":null,"editor":null,"howpublished":null,"institution":null,"journal":"IEEE Computer Graphics and Applications ","keywords":"","month":"jan","note":"","number":"","optkey":"","organization":null,"pages":"33-45","publisher":"","school":null,"series":null,"title":"The Reality Deck--an immersive gigapixel display","type":null,"volume":"35(1)","year":"2015","issn":"","doi":"10.1109\/MCG.2014.80","abstract":"","authors":[{"id":"109","first":"Charilaos","last":"Papadopoulos","url":"http:\/\/www.cs.stonybrook.edu\/~cpapadopoulo","rank":"1"},{"id":"39","first":"Kaloian","last":"Petkov","url":"http:\/\/www.cs.sunysb.edu\/~kpetkov\/","rank":"2"},{"id":"19","first":"Arie E.","last":"Kaufman","url":"http:\/\/www.cs.sunysb.edu\/~ari","rank":"3"},{"id":"57","first":"Klaus","last":"Mueller","url":"http:\/\/www.cs.sunysb.edu\/~mueller\/","rank":"4"}],"docs":[{"id":"1411","type":"IMG","source":"default.jpg","size":"4736","sizeX":"90","sizeY":"69"}]},