On the server where the Viabl.ai Platform is installed there is a 'plugins' folder which contains sub-folders of custom dialog controls, each sub-folder equates to one dialog control. This area of the installation can be edited by anyone who has access to the server side code. So by studying the examples distributed in this area additional custom dialog controls can be created.
So for example there is an 'mstars' folder distributed which results in the option to use 'stars' to capture and display values for numeric objects...