It is common in Servlet technology to be able to specify values in the form of variables with $ notation, e.g.
For example, in Tomcat you can specify variables like that anywhere in the config, e.g.
It'd make deployment much easier if Lucee will allow those variables as well
Cross reference: https://dev.lucee.org/t/configure-lucee-via-system-properties/91
Also, please consider allowing environment variables, as well.