elected by oneself without formal nomination

स्वयं-निर्वाचित

English Usage: The self-elected committee made all the decisions without external input.

Hindi Usage: स्वयं-निर्वाचित समिति ने बिना बाहरी इनपुट के सभी निर्णय लिए।

chosen by oneself rather than by others

स्वयं-चुने हुए

English Usage: The organization was led by a self-elected leader who refused to step down.

Hindi Usage: संगठन एक स्वयं-चुने हुए नेता द्वारा संचालित था जो हटने से इंकार कर दिया।