Change location of rstudio-prefs.json config file

Hi,

I'm using RStudio Desktop (1.3.959 - open source licence) on Windows Server 2019 and I would like to move the rstudio-prefs.json user config file from the default location (AppData/Roaming/RStudio) to an other location. I found a blog post indicating that it is possible (https://blog.rstudio.com/2020/02/18/rstudio-1-3-preview-configuration/), but the mean to do that is not mentioned. Is the solution consist in modifying an env variable? In this case, what is this variable?

Thanks in advance!