For deployment scanners, we have a relative-to attribute with the following description

"relative-to" => {
    "type" => STRING,
    "description" => "Reference to a filesystem path defined in the \"paths\" section of the server configuration.",
    "required" => false,
    "access-type" => "read-write",
    "storage" => "configuration",
    "restart-required" => "no-services"

However, there is nothing in the management interface that will return all the paths including the built-in ones like jboss.server.base.dir. I need the list of all paths to be able to give the user a drop-down in the console.