Looker application (extension) applied from within explore as a custom vis

[pjabl_community]

The following example repo: tile-visualization

states:

• Visualization: the extension behaves similarly to a custom visualization. The tile extension can be used in an explore and saved to a dashboard. The data is pushed to the extension via the explore or the dashboard.

Is it achievable from Looker web interface, or the extension code has to be updated.