Currently, it’s not possible, but it’s something we’re planning for future updates of Custom Modules. You could replicate some of the functionality of smart modules by reading headers and using location data in your Custom Module HubL.
Any updates on this? We have custom modules, such as a custom modal popup, which we need to make smart. We’re doing a migration from WordPress to HubSpot COS primarily to make use of it’s smart content functionality. It would be good to know how long we may have to wait for this functionality and what we should keep in mind in building our templates for smart content.