I’m not the developer, the add-on for Blender is developed by hlorus, but he didn’t, at this moment, added new features on Geometric Kernel.
The add-on of sketcher constraint solver use an external kernel, in fact is a set of library (Geometric Kernel) developed for an other CAD Solve Space, this kernel doesn’t have fillet feature.
But for info I point you to the documentation.
Greetings.
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