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Gutenberg Editor : Custom Shortcodes and Metaboxes #2002
@Ansif for the first point, you can add new blocks via the documentation you can find at https://github.com/WordPress/gutenberg/tree/master/blocks#readme
As part of this, you can add controls to the Block settings which appear in the sidebar.
As for adding entirely new expandable sections in the sidebar, this is not yet supported. But you can follow the conversation at #1352.