Inter Milan is not worried about the Serie A title at the moment. And I would say they don't need to worry. It is not possible for Inter Milan to win the Serie A title if Napoli can win their last two matches. And the important thing is that Napoli's opponents are very weak. The possibility of Napoli dropping points in these two matches is very low. So I don't think Inter Milan will give full effort for Serie A. But Inter Milan will definitely want to win the last two matches.
Normally, currently Inter Milan will definitely focus on the Champions League title right now because of how tough it is and how important it is for them to be the winners one more time. As for Serie A, Napoli are already at the top, although Napoli are leading with just 1 point, but as you said, there is high hope that Napoli will not lose points in their upcoming match since the opponents are weak, so I believe they will definitely secure points in that match.
Milan now has the Champions League title. Inter Milan has qualified for the final by defeating the hot favorite team like Barcelona. Undoubtedly, Inter Milan has the ability to be the champion. But PSG is not a weak opponent this season. Like the semi-finals, the final will also be very competitive.
Their final against PSG will be even tougher than the one they played to qualify for the final game because right now these two teams are very strong in the Champions League competition. Since the start of the match, they have been doing great. As for PSG, we already know how they play; they always surprise us with their results, and Inter Milan is not a team to be underrated. Anything can happen; the final game is unpredictable. Let’s see what will happen.