Uptime format optional days

[omnigenous]

"format": "{2}h {3}m"
Real uptime: 26 hours 34 minutes 17 seconds
2h 34m

then I changed format:
"format": "{1}d {2}h {3}m"
But I don't want to see 0d most of the time when my machine is not up for several days.

I want to make {1}d part (including space) optional and only display when hours >= 24 or days >= 1.

I tried different combinations with question mark and brackets, none of them work:
{1?}d {2}h {3}m -> {1?}d 2h 53m
{?1}d {2}h {3}m -> d 2h 53m
{{1}d ?}{2}h {3}m -> {1d ?}2h 54m
{?{1}d }{2}h {3}m -> {?1d }2h 54m
{{1}d ?}{2}h {3}m -> {1}d ?}2h 54m
{?{1}d }{2}h {3}m -> {?{1}d }2h 55m

[CarterLi]

fastfetch -s uptime --uptime-format '{?1}{1}d {?}{?2}{2}h {?}{3}m'

[omnigenous]

Oh, I see now {?CONDITION}IF TRUE{?}

[MiniRobotDev]

is there anyway to pad the numbers :
format: 1h 2m 3s
current: 1:2:3
expected: 01:02:03
i pad the numbers with 2 digit and fill missing digit with 0
what is the syntax to do that is there something like >0,2 exist ?