It is good to hear that Felix has found himself a team. A good one like Milan as well by the way. I think he will find much more time there unlike Chelsea.
He has already started to be used in the starting lineup actually. Sérgio Conceição wanted him to be loaned himself in the end so you would expect that.
He is playing in his natural position from now on which is extra good. Because he is normally a SS but he has been used in so many different positions and expected to be useful.
Joao Felix seems to be settling in well at Milan which I think is a good development for him given how much he lacked playing time under the new Chelsea boss and his recent moves from to different clubs in few years. I would like to see him stay permanently with Milan and performing well for them. Playing in his natural position also seems to be beneficial to him which is good I would love to see him excel at Milan honestly.
He is on loan now, the Seria A league might be a better opportunity for him to increase his worth, while at Chelsea i won't say his performance hasn't been good enough but he can do better where he is as we know the difference on how competitive both leagues are if matched. The Milan fans love him, they believe in him like he deserves to effortlessly contribute to the team, with much love and respect even from a legend like Ibrahimović he should be the one owing the club with goals and assists that will help the club.
There is no return clause for the player and still no buy option, despite Chelsea will not be needing him anytime soon since they already have spare strikers in the squad, i think Chelsea still considers him as full time part of the club's future.