I would think a custom field, for blocking quote hilighting might work.
Don’t consider quotes a string (when matches):
Otherwise you have to disable quote hilighting.
There’s also a bit of a bug in that regard, when you have a custom highlighter and do something like:
EmEditor thinks “” is the start and end of a string, and “” is the start/end of a string.
Possibly, as well:
Ignore Escaped quotes: