Feature Request

• Yes, I reviewed the contribution guidelines.

Describe your use case and the problem you are facing

For supporting the next iteration of Gutenberg block development, we need to extract strings from block.json files.

Describe the solution you'd like

wp i18n make-pot should parse block.json files and extract all strings it finds with the additional context.

For more information, check out:

• Add the block registration RFC WordPress/gutenberg#13693
• Replace inline JSON Babel plugin with a custom version which supports i18n WordPress/gutenberg#15169