podman system df --format '{{json .}}' is not compliant with docker output

[benoitf]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind feature

Description

I found an extension that parse the output of the JSON generated by system df command and the output is not rendered using the same format than docker command

Steps to reproduce the issue:

1. podman system df --format '{{json .}}'

Describe the results you received:
{"Type":"Images","Total":5,"Active":1,"Size":1092221757,"Reclaimable":1092139196}

Describe the results you expected:
{"Active":"21","Reclaimable":"12.76GB (86%)","Size":"14.79GB","TotalCount":"73","Type":"Images"}

Reclaimable should have the size displayed with unit (like 12.76GB) and then it should have the percentage displayed
The same for the Size field.

Additional information you deem important (e.g. issue happens only occasionally):

Output of podman version:

Client:       Podman Engine
Version:      4.3.1
API Version:  4.3.1
Go Version:   go1.19
Git Commit:   814b7b003cc630bf6ab188274706c383f9fb9915
Built:        Thu Nov 10 15:26:55 2022
OS/Arch:      darwin/amd64

Server:       Podman Engine
Version:      4.3.1
API Version:  4.3.1
Go Version:   go1.19.2
Built:        Fri Nov 11 16:01:27 2022
OS/Arch:      linux/amd64

Output of podman info:

(paste your output here)

Package info (e.g. output of rpm -q podman or apt list podman or brew info podman):

(paste your output here)

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide?

Yes/No

Additional environment details (AWS, VirtualBox, physical, etc.):

[benoitf]

It looks like it's missing the percentage in the output

[rhatdan]

We must not be printing this out in regular podman system df commands, so open an issue on that, and we can add that output.

[benoitf]

ok I will