Chelsea's defense is strong, that's true, but PSG's attack is currently in great shape. They will want to do the same in the final as they destroyed Real Madrid's defence. I'm not predicting a draw like you are. I think PSG will win the final even if the goal difference is not that big. If the match goes to penalties as you think, PSG will still be ahead and win the trophy. We give our opinions from our own perspective, but the reality is that both teams have a higher chance of winning but PSG will be ahead of Chelsea in terms of great performance.
Although Chelsea's defense is strong, I have doubts about how strong it will be in front of PSG's attack. There are good reasons for this. PSG has already won matches by destroying strong defenses and by a large margin. So I think that you will not be successful against PSG through a defensive plan, but rather it will cause you more harm. Trying to keep the goal difference as low as possible by playing as aggressively as possible can increase Chelsea's chances of winning. PSG has already destroyed strong defenses like Real Madrid and Inter Milan and won both matches by a large margin. Chelsea's defense may be a stronger team than them. Let's see what happens on match day.