I want the A harmonic minor scale to appear below.
Because the harmonic minor scale is often used in minor songs.
can i add it in? I can’t find a way.
You can just switch to Harmonic Minor to grab chords from. There are no rules that says you can’t.
Yes, it is possible to crawl, but it is more cumbersome to crawl each time. The key is that I have to grab it every time. 
It seems that we can only grab