Interacting with UI Form via a test label instead of a label

Certified Associate Developer
This is with regards to Performance Testing. We are using Locust as the tool for PT.
We have certain Interface components where label is not defined as per design. 
When writing PT scripts Locust for Appian provides functions to interact with a "testLabel" if label is not available.
I want to interact with a dropdown using a test label. But the appian interface designer does not provide an attribute called "testLabel" for dropdown component.
Reference:

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