How to assign a drive letter to a smartphone [duplicate]

I would like to investigate the diskspace usage on my smartphone.

For that, I'm connecting my smartphone with my PC, using an USB cable.
Currently, in Windows explorer, it looks as follows:

I would like to do the following:

• Map network drive to that smartphone
• Create a mounting point from my WSL
• Launch a du -k . | sort -n in order to do diskspace analysis.

Let's start with the first: does anybody know how to assign a drive letter to a smartphone?

I already had a look on Youtube but the first video I saw started with "Please download this app", and I would prefer not to download any tools, neither on my PC, neither on my smartphone, for this.