Querying/flattening multi-level nested JSON in Cosmos DB when array name is random on one level deep down - sql

Question

I would like to get some help to write a query to get a flat JSON to feed Power BI.
The data store is a Cosmos DB container with JSON. The structure is fixed.
The example JSON stucture is this:
"orderid": "999888777",
"name": "dwayne.johnson",
"mainData": {
"giftData": {
"name": "Rocketship",
"giftDetails": {
"**123456789**": {
"boxInfo": [
{
"name": "Leonardo Da Vinci Big Box",
"city": "London",
"country": "United Kingdom",
"currency": "EUR",
"price": 99.43,
}
],
"colorScheme": [
{
"name": "Red Apple Delight",
"code": "123AAA",
}
],
"CourierInfo": [
{
"name": "UPS",
"code": "BBBA333",
}
],
"orderid": "444333434",
"name": "chris.rock",
"mainData": {
"giftData": {
"name": "Junglemaster XXL",
"giftDetails": {
"**32432423424**": {
"boxInfo": [
{
"name": "Gerba Tool Big O",
"city": "München",
"country": "Germany",
"currency": "EUR",
"price": 103.22,
}
],
"colorScheme": [
{
"name": "Green Mix",
"code": "999DDD",
}
],
"CourierInfo": [
{
"name": "GLS",
"code": "CCCGV3",
}
],
I would like to get to following output:
orderid
currency*
price**
999888777
EUR
99.43
444333434
EUR
103.22
*The path would be giftData.giftDetails.123456789 or 32432423424 or any random.boxInfo.currency
**The path would be giftData.giftDetails.123456789 or 32432423424 or any random.boxInfo.price
The question is how can I select the currency and price info 4 levels deep, when the container array name is a random number (in bold)?
Thank you very much for your time and help!