Access model's Remapped Materials through code

In project panel, if you click on any model object, like imported FBX model, Inspector shows Model Import Settings. If you selected Materials tabs and click Import Materials with Location set to "Use Embedded Materials", there will be a list of Remapped Materials.

I want to get access to this list of remapped materials to set any I want. Traces lead me to SearchAndRemapMaterials(), which is not configurable.

Any one knows exactly how-to? Thanks!