As soon as the Graphics View Framework is migrated (currently, not even widgets are migrated), you should be able to compile the Qt Charts source code with Lean

As soon as the Graphics View Framework is migrated (currently, not even widgets are migrated), you should be able to compile the Qt Charts source code with LeanQt, because the latter maintains compatibility with most of the Qt API. Whether this makes sense or not is a different question, since there is still original Qt which can install these things all at once if needed.