To be honest, depending on how many tools/features you want to add, that would be a very big project for a solo developer. You'd need to build all of that func

To be honest, depending on how many tools/features you want to add, that would be a very big project for a solo developer. You'd need to build all of that functionality yourself. You detect where the user is pointing/clicking, then draw the element they are creating as visual feedback, then once done, persist the element somewhere. If a user clicks on the element again, somehow display that it is selected and display the tools for editing. You could build it in vanilla JS, or use a framework like React.