Set the values in your dropdown <option value="frameworkCustomerLabel">framework</option>
<option value="teamCustomerLabel">team</option> and use the token in the search | eval teamCustomerLabel=case(issueLabel="customer1", "Customer 1", issueLabel="customer2", "Customer 2", issueLabel="customer3", "Customer 3", issueLabel="customer4", "Customer 4", issueLabel="customer5", "Customer 5", issueLabel="customer6", "Customer 6")
| eval frameworkCustomerLabel=case(issueLabel="customer1", "Group 1", issueLabel="customer2", "Group 1", issueLabel="customer3", "Group 2", issueLabel="customer4", "Group 2", issueLabel="customer5", "Group 3", issueLabel="customer6", "Group 3")
| chart count(key) as "Created" over _time by $grouping-name$ where top 50
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