Oviously there will be different ways to do this task, but I would appreciate hearing about your approach.

Let's say you have a clean vocal file (a cappella, without background music).

Since it is a famous song, like My heart will go on, so more or less, you already know the chords of the song.

From this point onwards, how do you proceed to make a backing track, using BIAB and other tools?

My sincere thanks,