anchor point - Sketch: Cog with rounded corners

I am new to Sketch and have been using Illustrator before.

Now I made a cog in sketch, however I don't want it to have hard edges, but rather rounded ones. Here is how I made my cog in Sketch:

Now when I select the shape, I can round corners, however it will only round the corners of the rectangles:

When I flatten the shape rounding corners for the "inner edges" (don't know what to call them) is greyed out:

In Illustrator however this is only a matter of a few clicks:

Here a better look at the desired outcome:

There surely is a way to do that in sketch, I figure. I'd be very thankful if someone could teach me how :)

Answer

I'm not a Sketch user, however if it's not possible to round the corners automatically, then it would be possible to do it manually.

• Create one tooth of a cog wheel, by drawing a rounded rectangle over a circle, uniting, and manually editing the curve by adding an extra anchor/node


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  One half of the circle should suffice, as you can delete the other half, reflect the part with the rounded tooth, and do a boolean operation to unite it

  
  


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  Then duplicate and rotate the tooth around a circle

  
  


• Then do a boolean operation to unite all the pieces

Here's a quick animated proof of concept (done in Inkscape), but I'm pretty sure it could be done in any vector image editor, with basic operations.