Specify your own jmx roles file.
Make sure the permissions forbid "others" from reading the file if you're using Cassandra below version 3.11.
Declarations
Type
null or path
Default
{
_type = "literalMD";
text = "generated configuration file if version is at least 3.11, otherwise `null`";
}
Example
"/var/lib/cassandra/jmx.password"