Articles published in supplements generally cannot be used as titles.
If you just publish your own paper, it doesn't matter much whether you add it or not.
In addition, the law does not say that the articles published in supplements are different from those published in normal journals, so they enjoy the same legal rights and interests. However, people often treat it differently in life and regard it as a "sub-publication".
The supplement is one level lower than the main issue (for example, the main issue is the core of Chinese, and the supplement is a general journal).
However, as long as it is a professional title evaluation publication recognized by your unit, there is no such thing as a regular publication or supplement.