Yes, opening the soffits on front of coop would be good.
Hopefully there is also a roof overhang in the back, open those soffits also to create some passive flow.
Some top hinged, glazed windows might be good on the sides,
propped open all summer for protected ventilation, and closed in winter priding light.
The numbers cited are not magic, but a popular rule of thumb.
The more ventilation the better.
Ultimately the temp and humidity should be the same inside the coop as outside the coop.
Oh, and....
Welcome to BYC! @Nicrom
Where in this world are you located?
Climate, and time of year, is almost always a factor.
Please add your general geographical location to your profile.
It's easy to do, and then it's always there!
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