applications – chrome plating and adding flags

I've therefore modified the chrome with an adblocker for me, but I hate the new 68+ chrome look and really want to reactivate the old look. IIRC in chrome 67, there was a flag that allowed you to switch between the old design and the modern look, but this flag was removed in the new chrome versions for Android. I did not find anyone who reactivated the old look elsewhere, so I came here for help / advice.

What would I do to reactivate the flag / old appearance?
How could I do it?
Do you know someone who has done something similar?

Thank you!