Organization Act of Diplomatic Missions of the Republic of China (Taiwan) Article 10

Depending on the needs of diplomatic missions, MOFA and Agencies may hire specialists in accordance with the Act for Hiring Contract Workers. The number of hires shall not exceed three percent of the budgeted personnel quota for diplomatic missions.
中文原文 駐外機構組織通則第10條
外交部及各機關得視駐外機構實際需要,依聘用人員聘用條例聘用專門人才,其員額合計不得逾駐外機構總預算員額之百分之三。

English translation for reference only; the Chinese text prevails. Not legal advice.