fix: make target contian an array of target objects
i guess we miss-specified array of objects here: https://subugoe.pages.gwdg.de/ahiqar/api-documentation/page/annotation-api-specs/#annotation-item-object
i guess we miss-specified array of objects here: https://subugoe.pages.gwdg.de/ahiqar/api-documentation/page/annotation-api-specs/#annotation-item-object