registerPlugin for Site Editor + useSelect for wp_navigation wp_template_part post types

[SamTyurenkov]

Hi there, probably a dumb question here, I think I am missing something.

Is there out of the box logic which will make registerPlugin work in sidebar inside the Site Editor?
I cant get any element rendering there, tried PluginSidebarMoreMenuItem, PluginSidebar, PluginDocumentSettingPanel
They are properly working in regular Block Editor though.

Also, besides rendering, I would like to use useSelect, useDispatch to get and update post meta of wp_navigation and wp_template_part post_types, but Im getting undefined. What is the recommended way to access that data?
I tried

import { useDispatch, useSelect } from '@wordpress/data';

	const postId = useSelect( ( select ) =>
		select( 'core/editor' ).getCurrentPostId()
	);
	const postType = useSelect( ( select ) =>
		select( 'core/editor' ).getCurrentPostType()
	);
	const { postMeta } = useSelect( ( select ) => {
		return {
			postMeta: select( 'core/editor' ).getEditedPostAttribute( 'meta' ),
		};
	} );

[SamTyurenkov]

Update, found out the answer for first question - there are different imports for block and site editor:

import { PluginSidebar, PluginSidebarMoreMenuItem } from '@wordpress/edit-post';
and
import { PluginSidebar, PluginSidebarMoreMenuItem } from '@wordpress/edit-site';

Still need help with postMeta

[SamTyurenkov]

Update:

I ended up with custom REST API endpoint which returns custom data from wp_postmeta table for wp_navigation and wp_template_part post types
And in component trying now to implement fetching/saving with useEffect and apiFetch.

Please advice if there are other recommended ways to obtain postMeta for above mentioned post types.