Judging from how Chelsea has been performing poorly in the Premier League lately, I didn't believe Chelsea would even beat Everton because Everton has been a strong opponent to beat in the Premier League lately, so I agree with you that Chelsea was lucky to beat Everton in this match.
Chelsea's struggle to win this match was quite good. Yes, even though the ball dominance was not too far, but at least, this was Chelsea's attack quite good, although the accuracy was not that strong to penetrate Everton's defense which was quite strong this time. So from 7 shots on target, only 1 goal went in. I really salute Everton's back line this time. Fortunately, Everton's attack was not that strong so Chelsea could only hold on with 1 winning goal until the end.
Now, let's wait a special day for the FA Cup semi-final of Nottm Forest vs Man City.
I really think that Man City will win this match based on their performance in current situation.