ASM Wildcard parameter no match except *

Hello,

I'm having some trouble creating a manual wildcard parameter that will actually be used by ASM instead of the more general * parameter.

HTTP request POST contains the following:

{"file_ids":[],"message":"Some user input","channel_id":"blahblah".....}

ASM violations are triggering on the "message" field in the above string. I'd like to create a parameter for the "message" field so I can address it directly. However, ASM uses the * wildcard parameter regardless of my attempts to create a wildcard parameter for it such as using following:

message":"(.*)","channel_id
message\":\"(.*)\",\"channel_id
"message":"*","channel_id

Any help would be appreciated.