The way we have tackled this so far is to create an ACF field for “Right Sidebar” and “Left Sidebar”. Inside there we can use shortcodes, but we can’t use blocks there yet.
However, we also did some work to figure out how to use Gutenberg’s “reusable blocks” concept in a shortcode, and make those available to these sidebar ACF fields. In an indirect way, this has made it possible for us to use Gutenberg code in the ACF fields. It’s certainly a roundabout way to do that, and not our primary intent or use case, but it (kinda) works.
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