Place custom blocks with markdown - Notion Docs

Custom blocks are in private alpha:

Do not discuss publicly or share with anyone outside your workspace.
Access must be enabled per workspace. Installing the SDK does not grant access.
These APIs may experience breaking changes without notice.

Place a custom block

Use a self-closing tag on its own line to place a custom block. Replace the example UUID with a definition ID for a custom block deployed to your workspace.

Text before the custom block.

<custom-block definition-id="11111111-1111-4111-8111-111111111111" />

Text after the custom block.