How to show only C: in disk ?

[wincmd64]

{
"type": "disk",
"keyColor": "green"
},

What should I add here? Thx

[CarterLi]

"folders": "/"

[wincmd64]

Thx

PS.
If "TPM" missing, then it doesn't show the key itself.
Is it possible to make it display something like "TPM: n\a" in this case?