If you write it yourself, it will not be effective. Only the one issued by the Patent Administration Department of the State Council upon application will be useful.
Article 61 If a patent infringement dispute involves an invention patent for a new product manufacturing method, the unit or individual manufacturing the same product shall provide proof that its product manufacturing method is different from the patented method.
If a patent infringement dispute involves a utility model patent or a design patent, the people's court or the department managing patent affairs may require the patentee or interested party to issue a certificate issued by the patent administration department of the State Council regarding the relevant utility model or design. The patent right evaluation report produced after retrieval, analysis and evaluation is used as evidence for hearing and handling patent infringement disputes.