Query Post Object in WP Admin

The Beta of ACF 5.8 lets you create Gutenberg blocks with custom fields.
You can preview these block in the editor. Sadly, you have to be an ACF-Pro customer to use the beta.

Otherwise you could try to fetch the custom fields via the REST-API utilizing this plugin: https://github.com/airesvsg/acf-to-rest-api/

Refer to this answer on how get the current Post ID in Gutenberg.

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