powershell csv to json with multiple level of array - arrays

Question

Currently I am fetching the data from flat CSV and converting it to json. I am able to take it two level down with three Arrays like below
The CSV file contains the following data.
The code I have written to achieve the above is using array,powershell object and convertto-json
$ArrayAPPName = #()
$ArrayAPProles = #()
$Arrayserver= #()
$i = 0
foreach ($item in $CSV) {
if ($i -eq 0) {
$JSONappname = $($item.'AppName')
$JSONapprole = $($item.'ROLE')
}
if ($($item.'AppName') -ne $JSONappname) {
$ArrayAPPName += [pscustomobject]#{
AppName = $JSONappname;
Roles = $ArrayJSONroles
}
}
$ArrayJSONserver = [pscustomobject]#{
CPU = $item.CPU;
RAM = ([int]$item.Memory);
}
if ($($item.'AppName') -eq $JSONappname)
{
[array]$ArrayJSONroles += [pscustomobject]#{
Role = $($item.'ROLE');
Server = $ArrayJSONserver
}
}
else {
[array]$ArrayJSONroles = [pscustomobject]#{
Role = $($item.'ROLE');
Server = $ArrayJSONserver
}
}
$JSONappname = $($item.'AppName')
$i++
}
$ArrayAPPName += [pscustomobject]#{
Name = $JSONappname;
Roles= $ArrayJSONroles
}
$ArrayAPPName = [pscustomobject]#{
Apps = $ArrayAPPName | Select-Object -Property Name, Roles
}
$ArrayAPPName = $ArrayAPPName | ConvertTo-Json -Depth 10
However, Now we have situation where for same role we can have multiple
server request. so for each application name, we can have multiple application
role and for each application role we can have multiple Server.
{
"Apps": [
{
"AppName": "ABC",
"Roles": [
{
"Role": "App",
"Server": [
{
"CPU": "2",
"Memory": "1024",
},
{
"CPU": "2",
"Memory": "2084",
}
]
}
]
}
]
}