Stretch part of image at angle?

[c4cc]

Credit to @PixLab for teaching me Liquid Rescale, as per his tutorial:

https://www.youtube.com/watch?v=WFT1cnZomLM

Now, how do I use Liquid rescale (or any easier alternative methods) to stretch image sections at an angle? Here, I'd like to stretch this character's lower torso as shown out longer, but without messing up the image in any way.

https://ibb.co/WWyz3z1