Direct and Diffused component of shortwave radiation in ERA5 data

I am following the paper to calculate UTCI using ERA5 meteorological variables.

https://link.springer.com/article/10.1007/s00484-020-01900-5?shared-article-renderer

In the paper, the authors have mentioned that they are using ERA5 product. And specifically mentioned to use the direct and diffuse component of shortwave (SW) radiation.

The problem is, ERA5 data does not provide the direct and diffuse SW separately. Rather it only provides Surface solar radiation downwards which includes both the direct and diffuse component.

My question would be, is there a way to calculate the direct and diffuse component of SW from ERA5. The dataset I have is similar to ERA5 and has the Downward SW and Net SW. I have no problem in obtaining the Long waves BTW.

Any help would be much appreciated. TIA