Yes, but not with openHAB. At least not easily.
You are better offf using a special purpose service for that sort of thing. I recently discovered and stared using Beszel which is the easiest such tool I’ve used so far. See Simple home lab monitoring dashboard using Beszel.
Beyond that, you won’t have enough resources to run another OH instance on that RPi 2 to report the system stats. You could write a Python script that gathers the stats and pushes them to OH over MQTT or through HTTP calls. There might even be something like that on Github somewhere.