Thanks a lot I can confirm this is working.
In agent config add:
ExternalCommandTimeout = 30000
Timeout is in milliseconds..
In agent config add:
ExternalCommandTimeout = 30000
Timeout is in milliseconds..
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Show posts MenuFor ($i=0; $i -le 30; $i++) {
Start-Sleep -Seconds 1
"Rad $i = " + (1 * $i)
}

[ExternalTable/PBSBackup]
Command = proxmox-backup-manager task list --all --output-format json-pretty | jq -r '(map(keys) | add | unique) as $cols | map(. as $row | $cols | map($row[.])) as $rows | $cols, $rows[] | @tsv'
Separator = \t
InstanceColumns = Index
Description = Proxmox backup server status
PollingInterval = 320