After installing addon for Contact Form 7  , you can configure tags for each form also.

• Go to Contact > Contact Forms
• Create a new form or select an existing form.
• Go to Intercom Subscription  You should find a section name Tags along with a Text input field.

• Enter your custom tags on the field. You can further:
  • Press either a comma (,) or Enter to separate tags.
  • Press Backspace to delete the last entered tag.
  • Click on the cross icon beside a tag to delete the specific tag.
• When done, click Save at the bottom.

You should now be able to use the Tags feature with Contact form 7 and let your users get listed on Intercom with the tags you saved. It is recommended to test on the frontend like a user before you offer the form to users.