Azure devops pipeline access Json file inputs and perform for(each) loop - azure

Question

I am using, Linux agent, I need to iterate over json input objects for each project.
I have below json file and It may have more than 200 charts, I need perform build, lint, templates and push to repository, I can do this using shell/python, but I thought to use Azure pipelines yaml code.
{
"helm": {
"charts": [
{
"project1": {
"secretName" : "mysecret1",
"setValues": ["a", "b", "c"]
}
},
{
"project2": {
"secretName" : "mysecret2",
"setValues": ["x", "y", "z"]
}
}
]
}
}
azure-pipelines.yaml:
trigger:
- '*'
variables:
buildConfiguration: 'Release'
releaseBranchName: 'dev'
stages:
- stage: 'Build'
pool:
name: 'linux'
displayName: 'Build helm Projects'
jobs:
- job: 'buildProjects'
displayName: 'Building all the helm projects'
steps:
- task: HelmInstaller#0
displayName: install helm
inputs:
helmVersion: 'latest'
installKubectl: false
- script: chmod -R 755 $(Build.SourcesDirectory)/
displayName: 'Set Directory permissions'
- task: PythonScript#0
inputs:
scriptSource: inline
script: |
import argparse, json, sys
parser = argparse.ArgumentParser()
parser.add_argument("--filePath", help="Provide the json file path")
args = parser.parse_args()
with open(args.filePath, 'r') as f:
data = json.load(f)
data = json.dumps(data)
print('##vso[task.setvariable variable=helmConfigs;]%s' % (data))
arguments: --filePath $(Build.SourcesDirectory)/build/helm/helmConfig.json
failOnStderr: true
displayName: setting up helm configs
- template: helmBuild.yml
parameters:
helmCharts: $(HELMCONFIGS)
Json input is saved to HELMCONFIGS variable in azure pipelines, As per Azure documents, it string type and we cannot convert to any other type like array.
helmBuild.yml file:
parameters:
- name: helmCharts
type: object
default: {}
steps :
- ${{ each helm in parameters.helmCharts }}:
- ${{ each charts in helm}}:
- ${{ each chart in charts }}:
- task: AzureKeyVault#1
inputs:
azureSubscription: 'A-B-C'
KeyVaultName: chart.secretName
SecretsFilter: '*'
RunAsPreJob: true
I am not able to access chart.secretName, How to access to secretNames input?