updating values in JSON using PUT method - json

Question

I have a nested JSON file. I want to update some values with PUT method. I can change some values, but the problem is in the nested values.
$Authorization = "Bearer API-KEY"
$update = [ordered]#{
name = 'ppp'
asset_tag = 'BBB'
custom_fields = #(
[ordered] #{
Mediensatz = #(
[ordered] #{
value = "B2T-XXX"
}
)
}
)
}
$json = $update | ConvertTo-Json -Depth 100
#Write-Host $json
$response = Invoke-RestMethod 'URL' -Method Put -Body $json -ContentType 'application/json' -Headers #{'Authorization' = $Authorization}
My JSON file look like this:
{
"total": 888,
"rows": [
{
"id": 11,
"name": "AAA",
"asset_tag": "CCC",
"model": {
"id": 34,
"name": "TTT"
},
"user_can_checkout": true,
"custom_fields": {
"Mediensatz": {
"field": "lll",
"value": "B2T-YYY",
"field_format": "ANY"
},
"Ueberschreibschutz": {
"field": "lll",
"value": "2019-07-10",
"field_format": "DATE"
}
}
}
I can change the "name" and "asset_tag", but the problem is "value" in custom_fields → Mediensatz → value.
When I try to run my code with Write-Host $json it's look like this:
{
"name": "PPP",
"asset_tag": "BBB",
"custom_fields": [
{
"Mediensatz": [
{
"value": "B2T-XXX"
}
]
}
]
}