Hi Sanal,
you are trying to configure a custom response page for a specific type of violation. This can be achieved with iRules. While I don't have a "ready" solution for you, I can share you the link to the manual chapter: Working with Violations
There are a couple if iRule code samples which you can use to make your own iRule. Closest to your requirement is the code snippet that starts with this line #RequestBlockingWithBRP, look at the part below New style Start.
You could also redirect to a custom blocking page, use inline html or iFile. In case you use inline HTML I'd recommend to store CSS/JS/other files in a CDN.
KR
Daniel