The Automation Assembler infrastructure-as-code editor lets you click or hover for syntax and code completion help. To view the complete set of cloud template resource properties though, sometimes called custom properties, refer to the consolidated resource schema.
The schema is available from the Broadcom Developer portal or https://developer.broadcom.com/home. Follow the link below, and click Data Structures to list the resource objects that are available for cloud templates, formerly called blueprints.