Joao Cancelo and Joao Felix don't seem to want to return to their respective clubs next season even though they actually don't know what the future holds. Barcelona treats these two players very well and both players are able to give their best for their team now. Felix would definitely be happy if Barcelona wanted to make his contract permanent, as would Joao Cancelo.
Joao Felix will want to remain in Barcelona because coach Xavier Hernández gave him a chance when he was rejected by Atletico Madrid and Chelsea. But he would not be allowed to leave without Barca paying a high fee for him considering his current improved form. He still has a contract with Atletico till 2029 and Diego Simone is well known for making huge profits from the club. I was happy he scored in yesterday's game and he also showed his respect for his former club by not celebrating.
In the last two matches between Barcelona and Atletico Madrid, Joao Felix was able to score goals. He was relied on by Xavi and Felix repaid that trust with a goal for a team that neglected his quality as a player. As long as Diego Simeone is still the coach of Atletico Madrid, Joao Felix will probably not return to Atletico Madrid regardless of where he is loaned or sold permanently.
Felix has never hidden his love for Barca and he had to take a massive pay cut to facilitate his move to Barca. His greatest desire will be to get a permanent deal in Barca because he will never want to play under coach Simeone. He would even prefer to be on loan in Barca until his deal with Atletico runs out.