How to change label of workspace tab name of custom object

I need to change the text of workspace tab name of custom object. 

This label automatic setting the lookup name of custom object with workspace, but I need to change the multiple custom field text from not lookup name field.

I couldn't find a suitable feature, so I created an add-in using the BUI extensibility framework and used workspaceRecord.addDataLoadedListener to get the value of the custom field when the workspace was loaded, and document.querySelector function to overrides it's get value. However, this method will probably not work if the service cloud changes the structure of the HTML output DOM.