Serration effect to plain font...

Hello, 
I have plain edged font already designed. I want to add Serration edged effect to all glyphs in one go. Manipulating all glyphs and achieve smooth Serration effect is very hectic and time consuming. I am using FL8.
Can you please tell me all possibilities and step by step procedure to achieve this effect either it is by python coding or adding a special character like _cap.name in glyphs to add serifs?
Also can you please tell me how to write a code for the same effect. I am attaching the SS for ref. I have manipulated this 3 character manually then also it has flaws at junctions of H.

Thank you.

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