You can do this with a change block in the input object that sets a new token to the label, like:
<change>
<set token="dropdown_label">$label$</set>
</change>
See the following link for more details:
https://docs.splunk.com/Documentation/SplunkCloud/8.0.0/Viz/tokens#Access_labels_and_values_of_form_inputs
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@montgomeryam I could not figure this out on the splunk side. But if you contact your windows admin, there is place where you can uncheck check-boxes to exclude cs-cookie and other fields from logging. So there is no data for splunk to pick up.
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