Analyzing writing style for use in GPTs

Hi,

I work with lots of short formal memos (5-10 sentences), so im creating a GPT for writing these memos.

So I loaded one of the memos into a normal gpt4 chat and just told it to analyse and summarize the style. This style description I added to the instructions of the GPT.

This worked ok but the style wasnt completely captured, so uploaded a sample memo as a knowledge file. That worked ok as well but only for the same category of memo.

I wonder what the best ways are for analysing and capturing writing style?

Cheers F.