d8: Import content using json file

I installed default content module for import data in json format. I have my json here. [my_module/content/[entity_type]/anything.json]

After Profile installation completed, I enabled my custom default content module with content sample json for node entity.

I am not getting any error, but content not imported. So, I would like to know, how should I import my default content using  Default Content for D8 in brief.

here is my github code, https://github.com/latikavs/drupal-profile-8

Need urgent help. Thanks in advance.

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/22/feed