Probably not
1. We don't even know if Elbaf will be a major fighting arc
2. There is no indication that he will need CoC to defeat his future enemies (YC2's and possibly the 3rd-strongest admiral) - with the introduction of ACoC Oda has made it clear that most of those whom Luffy will be facing in the future will have it, and now with Zoro we can be pretty sure that Mihawk will have it as well. We also already have an example of a YC1 who has CoC (Katakuri)
3. Any indications or hints that Sanji has/will get CoC are very, very vague and weak connections that are highly unlikely to be intentional connections drawn by Oda - while there has been some relative inconsistency surrounding what it means to "have the qualities of a king," it ultimately boils down to the fact that Oda has made specific connections in the similarities between Luffy/Zoro's pursuit of their dreams/goals/ambitions and it starkly contrasts Sanji's
However, as I've said previously, if Oda legitimately thinks that Sanji needs to develop CoC in order to defeat his future enemies then perhaps Sanji will get it. Otherwise, it seems abundantly clear to me that Oda wants to go down a different route of power-ups and general development for Sanji. I don't even know when there will be time in the story for Sanji to get another character arc that involves Germa and Judge again to complete a storyline of Sanji "breaking free of Judge/Germa through his conqueror's haki" or something like that. Germa has already spilled over into the next arc, it would honestly just get incredibly redundant if this plotline continued