Is it possible to mix own news and recent posts in your ticker?

Yes, you can do that. You would need to purchase the Posts Ticker extension https://codecanyon.net/item/ditty-posts-ticker/3967314?ref=joemc and then you can use the “Mixed” mode to display a combination of custom ticks and recent posts.

Please refer to this article https://metaphorcreations.ticksy.com/article/3044/ for more inof on using Mixed mode.

Thanks!