Use an expression in a conditional statement

And likely never will. Rule Machine runs locally on the hub, with limited resources. webCoRE runs in the cloud with virtually unlimited resources at it's disposal.
Many folks have had issues running webCoRE on their hubs but there are many of us that still run webCoRE with a limited number of Pistons. Myself I run only one piston presently just because I haven't had the time to move it over to a custom Groovy app yet. But I see no system degredation because of it and my hub runs snappy and consistently without issue. So, if you want to try installing webcore and importing your piston over, there is a set of converted apps that have been optimized for Hubitat.