The part of the sentence "have even been" is correct and usable in written English. You can use this phrase to emphasize and add to the idea of something that has already happened. For example: "Families have had to struggle financially during the pandemic, some have even been unable to pay rent."
Investors have even been forgiving.
There have even been hints of goodwill.
Some have even been filmed doing it.
She may have even been urinated on.
There may have even been an ocean.
There have even been in-game riots.
Some have even been shifted to Britain.
Mangoes have even been tools of diplomacy.
There have even been lawsuits.
There have even been savings.
There have even been knockoffs.
Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia