Micro.blog posts with a title should just show up in other Bluesky apps that support Standard.site. For example, I just signed in to Leaflet and this is what I see under Posts. These are all posts that I created on Micro.blog.
What isn’t possible yet is editing posts across platforms. That’s outside the scope of Standard.site right now.
We also don’t send short microblog posts without a title to Standard.site. Honestly not sure if that should be enabled, or maybe a preference, since Standard.site was designed for long-form blogging.