I would say the Atalanta team has already qualified for the Champions League. The team is now fifth in the table. Atalanta team is 5 points ahead of Roma. The Roma team is not in good form right now. They have lost points in their last three matches. Meanwhile, Atalanta are in very good form. So it is highly unlikely that Atalanta will lose the last two matches and Roma will win both matches.
With 6 point difference and only 2 remaining matches, Atalanta have 99% to appear in Champions League next season and they will try to get it after this weekend. If they succeed with this task this weekend, they will fully prepare for Europa League final match with Leverkusen so no reason to don't play with their best and get only one more point to achieve their target one earlier week.
I think Roma will be happy to qualify for the Europa League. Because Roma has very little chance of surviving in a competitive platform like the Champions League.
I see Roma and Atalanta are similar in quality and it's not true to say Roma will struggle in Champions League while Atalanta will not.
So Roma will fight for the Europa League title next season as well. Moreover, the performance of the team is quite messy at the moment. It is very important to make the team more stable.
Roma will have to win their remaining matches and defend their sixth position against Lazio. After getting some bad results recent matches, now Roma are no longer safely against Lazio with only 1 point difference.
If they successfully secure their position, they will play in Europa League a third season consecutively and I believe they will not feel happy with failure to get a chance to play in Champions League again.