https://aescripts.com/draew/

Draw and animate inside After Effects! By converting your art into editable shape layers in your timeline, drAEw facilitates the workflow of motion designers, animators, and storyboard creators.Draw, animate, and deploy shapes frame by frame in a single panel. With vector tools, onion skins, and real-time shape exports, drAEw makes animation and storyboarding smooth and fast. It gives you precise control over your needs and gives you the freedom to create your sketches.