ASM TS cookie

currently i am getting the ASM TS cookie at client side without encrypt

There really is no way to encrypt the ASM cookie, no. I'm not sure that encrypting this cookie would gain you much, however, as it is already a hashed value. You can't modify it without impacting the hash and causing it to fail validation. You can't unencrypt it, as by definition a hash cannot be reversed.

So no, but you really wouldn't need to.

Did you try following below solution article ?

https://support.f5.com/csp/article/K13787