In the Unicode charts, I found U+FBA6, which is the letter heh, isolated form. Now I have the word هذﮦ
(the last letter is U+FBA6) from which I can use the letter via copy and paste.
The downside is that the above only works if the ه appears on its own, without vowels. Therefore rendering هذه works, but هَذِهِ doesn't. In the latter case, the vowel is placed too far to the left.