Using irule - ASM Information leakage detection on POST request

Could you please help me to provide a solution to use ASM - Specific block setting ( eg : Information leakage detection ) for specifc request type ( eg : only on POST requests or specific URIs within application ).

I have been asked not to create multiple ASM policies. As per my understanding there is no direct solution however heard that this can be done using an iRule. Your expert guidance is highly appreciated.

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