You're right, I was totally blind! But the photo misled me because you have a transverse engine, so I thought the connector would be under the cover. Then I expanded my search area, and sure enough, I found it. I'll definitely try it out.
Oh yes, are you referring to the needle lift valve on the 3-cylinder engine? (At least with a longitudinal engine, it's the third one.) (I know, I'm so ignorant...

)
The adjustment of the fuel injection start time is actually the more interesting topic for me!
Thank you for your understanding!