It seems that you mean to file an international application. You can submit a PCT application like this. In principle, you can find China National Intellectual Property Administration and foreign organizations that accept PCT applications. However, if you apply directly to a foreign country without first reporting to China National Intellectual Property Administration for confidentiality review, if you enter China again, it will be affected. So, apply to China National Intellectual Property Administration directly.
PCT application can specify the country you want to apply for when submitting, and it is not necessary to apply in a single country, and the given international application date is equivalent to your application date in each country.