[NTG-context] ConTeXt expression evaluation in Lua

I apologize for maybe a trivial question, but I found it nowhere. It is possible in Lua to find value of counter (or dimension) that has been set in ConTeXt? Eg. \newcounter\mycount \newdimension\mydimen \mycount=5 \mydimen=12pt % It will be the parameterS of Lua function \startluacode LuaFunction("Filename.csv", VALUEOFCOUNTER("\\the\\mycount"), VALUEOFDIMENSION("\\the\\mydimen")) \stopluacode Thanx Jaroslav