Gutenberg & Pre-formatted Templates: Core Block Attributes

The Gutenberg Handbook currently has a short entry for creating whole templates of blocks, e.g. used for Custom Post Types or just pre-formatting posts.

https://wordpress.org/gutenberg/handbook/templates/

It seems to be missing a comprehensive overview of the core/-blocks though. Especially the available attributes are interesting here. Is there a reference-entry I am just missing?

To elaborate:

By playing around, I found out a few things. E.g. preformatted blocks do take the formatting of a php file like line breaks, indends and tabs, which makes them a bit sensitive..

array( 'core/preformatted', array(
                            'content' => 'Grundlegende Fakten:

Operator: Max Mustermann
Wo: City, Country
Wer: 99999 Kinder
Wieviel: 99999 Angestellte',
                            ) ),

This does translate into:
(note that every tab or indent before later lines would have been taken over as well)

So – what other possibilities do i have to modify the ‘content’ and ‘placeholder’ attributes? Is there documentation anywhere? Can I make use of the fact that they are arrays and insert selectors or other html? Like .. This does NOT work:

array( 'core/preformatted', array(
    'content' => array('selector' => 'h1', 'content' => 'Does this do anything?'),
) ),

..But this does:

array( 'core/preformatted', array(
    'content' => array('Does', 'this', 'do', 'anything?'),
) ),

And where can I find a comprehensive list of first order attributes, since e.g it’s not always clear whether a core/block will take a ‘text’-string or a ‘content’-array and so on..

To partly answer my own question:

As mentioned in this git issue you can use

console.log(wp.blocks.getBlockTypes());

in the browser console after all the Gutenberg magic loaded (e.g. in the editor window of a post) to show all currently registered blocks, inluding their attributes.

Another Info-Source:

The Git-Project of Gutenberg holds all core blocks and their properties can be accessed by

Name-of-Block*/index.js

Then find: const blockAttributes =