By using the Comala Metadata Plugin , you can define your own metadata in your exported content.
Before you begin: Before you can use the Confluence Metadata Plugin, a Confluence Admin has to install the plugin on your system.
To use the Comala Metadata Plugin:
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Open your HTML template and enter $metadata.from("Your-Value-Name") in the position you want to insert the metadata.
For example: $metadata.from("prodname") - 
  
Open your Confluence page, enter {metadata and press Enter.
The screen Insert 'Metadata (Metadata Plugin)' Macro is displayed. - 
  
Enter the value name.
For example: prodname
 The value name has to be the same as in your HTML template.
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If you don't want to display the metadata in your Confluence page, select the checkbox Hidden.
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Click Insert.
The macro is inserted. - 
  
Enter the wanted value in the macro and save the page.
For example: Scroll Versions 
If you export the page, the placeholder you inserted in step 1 is overwritten with the defined value.