Hello Pedro!
The Haskell Foundation is actually working out the intricacies of this as we speak!
In short, the question of ownership is not yet fully established, but the goal is for the Foundation to control the copyright and the trademark.
What do we intend to do with this control? Well, mostly prevent misuse/deception.
Uses like what you propose are fine. We can switch to email if you’d like to get it in more ‘official’ writing.