Please add a function to create an rss feed file for your blog. News Google does not see content from articles url. I have bad English. But I think you get the point. 

It has own sitemap.xml I think, just add it to google search tools

yes, I added to webmaster, articles appear much later, after indexing in google news and the problem is
sitemap_blog.xml added

You can influence that improving seo of your site.

I mean https://publishercenter.google.com/
and Google News, not a regular google search.

I was never checking that but would not say it has any impact if article is shown in google or not.

If possible, please add rss feed to your blog. Thanks.
Ok 

@Michael
RSS is more-less historical function in my opinion.