How to change the default rendering mode for materials in Unity?

Hello! I'm working with Images as planes that I imported from Blender to Unity. This process also imports the materials but those are imported as Opaque Rendering Mode so the transparency doesn't work in Unity.

The way I fix this is I change the Rendering Mode to Cutout. But if the model has many materials it can get tedious to be changing one by one to cutout rendering mode after importing them to Unity.

I would like to know if there is a way to change the default rendering mode in Unity or if you can change the rendering mode of many materials at once.

Thanks!