FFAppState and persistence

I'm using the following (snippet) to remove items from my app state...

FFAppState().waypointCache.removeWhere((item) => item.regionName == regionName);

Which works fine while you're running the app, but does not persist the changes if you restart the app. So I switched to using this...

final cache = FFAppState().waypointCache;

for (int i = cache.length - 1; i >= 0; i--) {

if (cache[i].regionName == regionName) {

FFAppState().removeFromWaypointCache(cache[i]);

}}

Which explicitly calls the removeFromWaypointCache function.

My question really is, is there any way of using removeWhere and having that persist? Just so I don't have to loop through all the waypointCache.

Thanks in advance.