Only those who are engaged in education will get the teacher qualification certificate issued by the Personnel Bureau.
Those who are not teachers should take the unified examinations around the country and obtain the teacher qualification certificate.
In other words, you can take the teacher qualification certificate before you take part in the work, or you can take part in the work before you take the teacher qualification certificate.
Different regions have different policies, and some places must obtain a teacher qualification certificate before they can take up their posts.
If it helps, I hope it can be adopted.