I don't think there is an easer way of checking this besides exporting the workflow to XML and searching for the field's name in the XML content.
System fields with name (e.g. summary, description, etc) and custom fields with key ("customfield_12345") will appear in the xml.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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