Viewing gltf models with dynamically changed materials in AR

Questions
1
  1. I have a GLTF model of a chair with material Fabric_1 applied on it.
  2. I have created a system where the user can change the material Fabric_2, Fabric_3 and Fabric_4 using texture loader in runtime on the chair.
  3. I have coded in webXR so that i can view my gltf model (chair) in AR
  4. how do I code so that when my user has changed the material on the chair, its reflected on the model viewed in AR in runntime?
2

its the same code and routine in desktop mode as it is in ar, just keep references to the subject object and change its material and .map texture settings