Export Trellis Page title (value) from attribute when exporting to HTML

We would like to share graphs created in Spotfire with our external customers. External customers will have access to these graphs via Salesforce. Our (internal) agent will be able to use the same graph in Spotfire to do the in depth analysis using Spotfire.

Currently it is possible to (batch) export graphs (in HTML) for each customer via the trellis functionality. Unfortunately it is not possible to not which graph relates to which customer. The customer name is only shown in the PNG-file itself. The name of the PNG-file seems to be random without any relation to the trellis value. Therefore it is requested to create a label in the HTML or identification in the PNG-file name to relate to the value of the trellis.