@Osman
I found the free-kicks taken stats. I think Ronaldo took some from the left side that were close enough for Pjanic. Taking a quick look on those stats it seems we didn't have as many free-kicks from dangerous areas this season.
FKs taken:
Ronaldo
Pjanic
Dybala
Ronaldo hasn't taken any free-kicks from where Dybala scores his goals from. There also aren't many if any free-kicks that Ronaldo has taken from the positions where Pjanic usually scores from. The one that Ronaldo has taken from the edge of the box was against Fiorentina when Pjanic didn't play.
Having said all that many of the free-kicks Ronaldo takes are from low percentage scoring positions and we would probably do better if we just had Pjanic playing the ball in to the box.