Real World UV Texture Sizes

Can anyone here please direct me to a WORKING plugin or video (for Blender 2.82a) where I can unwrap my UV 's to real world sizes. For instance, if I have a plane that’s an A4 paper, it unwraps to an A4 paper. Or, if it’s a 100mm x 150mm plane, it unwraps to 100mm x 150mm? While keeping their aspect ratios.

Thanks