The smart crop feature is specific to AEM Dynamic media, and renditions are pulled directly from the DM cloud. Under CRX, the asset metadata would not show smart crop renditions. For generating the smart crop URL for an asset, apply the processing profile[0] on the folder first and then upload assets. Once assets are processed under the Renditions section, you'll see the Smart Crop option, and if the asset is published, the option to generate the URL will show up.
[0] https://experienceleague.adobe.com/docs/experience-manager-65/assets/dynamic/image-profiles.html?lan...