Blender object with volume shader to unity (.fbx)

I have an object in blender wich has a shader that's using volume (not supported), so i could export it to .fbx file but it wouldn't work. So the only way to do it, is to get the actual object from it by using volume to mesh modifier. For demonstration i need it to get something like this: .But to use this method i would need to export an object with the shader to openVDB and after that import it back as volume (openVDB). Create a new object and use volume to mesh modifier to create same shape as volume. But i also discovered that i probably can't export object with the shader (material) to openVDB, and if, it still wouldn't work because volume would have deform or something like that (idk how to describe properly). Im not so sure about converting object with shader to openVDB. So is there a way how to create volume (an object) from this: