Not at the moment. The basic version of Element Creator only allows to create single element, like Blob Shape Image, etc. However, you can create the Tabs like element with limited customizability. Eg. you can create a tabs element with having 4 tabs and each tab settings can be grouped like Tab 1 Settings, Tab 2 Settings etc. The main reason behind the elementor creator is to allow users create Fusion Builder elements from their HTML and CSS code snippets. As long you have the HTML snippet that looks or works like the nested elements, you can easily create them.