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If you’re new to Qlik Cloud or Qlik Sense, start with this Discussion Board and get up-to-speed quickly.
AFAIK a variable has no TAG property (only fields and tables have it). A COMMENT property exists but it's not available from the script else only from the UI. In QlikView the variables-comments could be read/write per macros. In Sense it should be also possible with any API but I don't know which and how.
Beside this you may load your Excel directly within the data-model and providing the information in a table to give the users additionally insights.