At the moment we do not yet have a "Blog Posts" element inside the new editor. We are gradually adding new and improved versions of the old OP2 elements - but as this is a brand new framework, we cannot use the code from the old platform to build these elements.
In the meantime you could consider using a plugin to help you acheive this. There is a free plugin called "Display Posts" which you can search for by going to Plugins > Add New:
Once installed - you can use the code from this element inside our "Custom HTML" element. I found the documentation for this plugin here:https://displayposts.com/docs/
We know this element is one that is in demand so we'll do our best to get this added as soon as possible and obviously we'll have a super easy way for you to add and customize blog posts on your pages.