You can write there whatever you want. I wrote when I applied for an extension in Bangkok that I am thinking about applying for another language course. They did not care
we already pay indirect taxes in Thailand (at moment of purchase) and itβs no rule that people living in a particular country have to pay income tax, for wage, interest, profit, rent, that was earned in another country (how I did living in Europe and Cambodia while earning income from North America) so please spare us these platitudes