Rocker arm oil leak and noise help

Thank you all in advance. I am a 1 week old 2019 1.6 3008 user. There is an oil leak on the rocker arm upper cover in my car. I was going to change it soon. But this morning, while idling, the engine started making a noise as if it was going to stop and air started to sound. After that, a squeaking sound started to come. Is there a video? Has anyone experienced this? When I showed it to the mechanic, he said it was the rocker arm cover. I would appreciate it if you could help.

https://youtube.com/shorts/YNy018AyJpw?si=hYYDISZd9gGLDiflSes same as this