How to train on the pretrained weighs

Hi,
This more a feature request, can you make a guide on how I can use the arcface_r50_v1 pre-train model as part of my model and update its weights, and ready for adding one or two "fine-tuning" layers to it.
Honestly, I wanted to do it my self but I lack the skills and knowledge to do so
preferably with Keras and TensorFlow

Thanks