Gutenberg support has not yet officially landed in Sage. You can follow the pull request by Kelly Mears for an example of how to integrate Gutenberg into your theme:

Native Gutenberg templating and styles (#2144)

ACF blocks

See Sage, Gutenberg and ACF Blocks from Roots Discourse for discussion on using ACF, Sage, and Blade to create blocks. Some projects from the community to help with this include:

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