I don't think it is possible , at least on this version.

You can download pdf of file, that means you'll need to enter the chords in BIAB manually.

I went ahead to purchase the app. Shame their price structure is different for Android... I couldn't pay monthly. I had assumed that I could have edited the chords presented to me with the Pro version, I was mistaken. I have written to the tech people asking them if there is a way to edit the chords, will let you know what they say about it.
Still, it is a useful app to me.