Get Tomcat Java Settings

I want to write a test in groovy which will check Tomcat Java Settings, meaning whose which user inputs in "Configure Tomcat -> Java -> Initial Pool Memory/ Max Pool memory". Without having CATALINA_OPTS set or setenv.sh present. Is this possible? I searched everywhere in Tomcat folder for this information in order to extract it from the file where it is kept, but I didn't find it anywhere. Also, I tried to search for this information in Windows Registry, but I just found there Tomcat version and some other stuff that don't interested me.