Add feature Concave fillet

I want a feature to be added, the ability to make Concave fillets with the “chamfer/fillet” tool.
Instead of having to make a second cylinder, convex that cylinder and subtract the shape to make a Concave.

Attached you can find illustrations of what I am talking about.

Please add this and thank you.

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For these situations, I would draw the cross section (profile) of the bottom part, then revolve it.

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That only works for a simple circular shape. What about an irregular shape. Why can’t we have a concave fillet support? Seems really silly to not have this, I have to hack around this and do a normal fillet which I use as a subtractor to where I want my concave fillet. Please can we add this feature?