How do I exclude certain part of email from being scanned?

Hi there, I have enabled client-side auto Sensitivity labelling for emails in a tenant for PII detection using pre-built SIT & Trainable Classifiers. However, the issue is that the Email signature automatically makes the check true and applies the label automatically, which I want to avoid. 

Is there a way for me to exclude the signature part of the email from being excluded?

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