Jmeter JSR223 PostProcessor GET COOKIE

Every link I've found about cookies in JMeter is based on cookie manager. But unfortunately, JMeter losts cookies if path is changed, and I can't change jmeter properties to use solutions about that, so I have to use setting variable by JSR223 PostProcessor after request. But I can't find any information about that - every link is about using HTTP Cookie Manager.

Please help WITHOUT Cookie Manager.