[knot-resolver-users] Get readable text properties in request/response Lua functions

Trying to make Policy Based Routing routing. Looking for HOWTO/snippents of two API features : 1) Tracking Cache TTL for some records and ability to make requests against cache. 2) Printing some text properties in request/response (kres) functions - like domain name, is cached (yes/no), TTL, etc. As I understood docs regarding Lua/C bindings is not finished yes. But I'm not a experienced developer so reading .c files is not an option for me ;-)