How to import a vrm model?

I want to import a VRM format model. I know that Cocos creator does not support this format. I also know that VRM is based on glTF, and Cocos creator already supports it. However, by renaming the model from model.vrm to model.gltf , I naturally got an error.
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Can I programmatically access GltfImporter (gltf.ccc) in any way? I do not know how to open this file or access this importer. Is there a way to access it to inherit from it or will I have to write my own importer? Can I write my importer at all? Please tell me where to start.