Is it compulsory to mention "Requires In-App Purchase" in the screenshot/description?

My app has some functions that requires users to pay for the IAP to unlock them. I mentioned those functions in the screenshots/description, so is it compulsory to mention those functions require IAP in the screenshots/description?

See 2.3.2 in the ASGRs Accurate Metadata

Is it compulsory to mention "Requires In-App Purchase" in the screenshot/description?
 
 
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