Look for ergonomic chairs that have flexible recline settings in them and wide seat bases plus adjustable lumbar support. These elements make the chair more inclusive plus comfortable for various sizes.
Some chairs, for example, have sliding seat bases so you can fine-tune the seat's extension forward or back. Longer legs especially benefit from this for more thigh support if needed. Dynamic mesh backs or flexible lumbar pads can accommodate different spinal curves in chairs.
The right ergonomic chair will feel tailored to you as well as not one-size-fits-all even from it's not custom-made. If you are trying one out in person, take just a few minutes for adjustments. It’s likely the right fit for your body, if you feel aligned, balanced, as well as supported. After only just a few of the tweaks, you should feel in this way.
Yes, an ergonomic chair can be of use for you, regardless of your size or shape. The chair just needs designing with adjustability and support kept in mind.