How to Export Block Patterns
To export a block pattern, navigate to Styles Library > All Patterns.
Next, click Export under the block pattern you wish to download.
Your block pattern will download as a JSON file.
You can now import this block pattern to any WordPress site that has the Styles Library plugin activated.
How to Import Block Patterns
To import a block pattern, navigate to the All Patterns page.
Near the top of the page, click Import to import your block pattern.
Select the block pattern you wish to import and click Upload Pattern.
Your imported pattern will now appear in your All Patterns menu.