Will getting fillers on my chin naturally refine my face shape?

I am inquiring about chin filler......

My face is on the rounder side, so I'm concerned that my jawline looks short in photos and my profile looks a bit flat. I'm not considering surgery, but I'm looking into whether chin fillers can slightly refine the line.

People around me say that even just a little bit added to the chin can change your facial proportions, but I don't want it to look too pointy or artificial haha. I want just enough to make my chin look a little longer and refine my face shape naturally.

I have heard that chin fillers are sometimes combined with Botox; in my case, is the decision made after assessing the condition of the muscles as well? I would also like to know if there is any possibility of discomfort when speaking or chewing after the procedure.

Could I get guidance during the consultation on the duration of the filler's effect or the appropriate dosage for the first treatment?