How to practically use Media Library in Drupal 8.6

Now that Drupal 8.6 is released, I tried the experimental Media Library. It works great, but it needs some additions.

My key questions are:

How can I use core Media Library with CKeditor?
How can I fill custom fields added to media entities (images) on upload?

I can of course go back to entity embed, entity browser etc, but I was wondering if this is already possible through modules or tricks that extend the core Media Library.

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