There are no restrictions and formats in the specific implementation part. You should mainly explain the specific measures in detail, preferably with attached drawings. For example, for a product, you should also write down its structure, shape, connection relationship of various parts, how to assemble and use it, and so on. What are the good results compared with the previous technology? Of course, it is best to highlight your own inventions.
You can check several patents on the patent website and have a look at the full text.