Multiline script inside the arm template json blueprint artifact's deployment script

Are the arm template's deployment scripts, that integrated into Azure Blueprint support multiline scripts anyhow?

I mean.... like this

{
      "$schema": "https://schema.management.azure.com/schemas/2019-08-01/deploymentTemplate.json#",
      "contentVersion": "1.0.0.0",
  "parameters": {
    "First": {
      "type": "String"
    },
    "Second": {
      "type": "String"
    }
  },
      "resources": [
        {
          "type": "Microsoft.Resources/deploymentScripts",
          "apiVersion": "2020-10-01",
          "name": "demoSample",
          "location": "[resourceGroup().location]",
          "identity": {
            "type": "UserAssigned",
            "userAssignedIdentities": {
              "/subscriptions/xxxxxx/resourceGroups/xxxxxxxxxxx/providers/Microsoft.ManagedIdentity/userAssignedIdentities/xxxxxxxxxxxx": {
              }
            }
          },
          "kind": "AzureCLI",
          "properties": {
            "azCliVersion": "2.9.1",
            "timeout": "PT30M",
            "scriptContent": "
                    Command1
                    Command2
                    Command3
              ",
            "cleanupPreference": "OnSuccess",
            "retentionInterval": "P1D"
          }
        }
      ]
      }

, but not:

{
      "$schema": "https://schema.management.azure.com/schemas/2019-08-01/deploymentTemplate.json#",
      "contentVersion": "1.0.0.0",
  "parameters": {
    "First": {
      "type": "String"
    },
    "Second": {
      "type": "String"
    }
  },
      "resources": [
        {
          "type": "Microsoft.Resources/deploymentScripts",
          "apiVersion": "2020-10-01",
          "name": "demoSample",
          "location": "[resourceGroup().location]",
          "identity": {
            "type": "UserAssigned",
            "userAssignedIdentities": {
              "/subscriptions/xxxxxx/resourceGroups/xxxxxxxxxxx/providers/Microsoft.ManagedIdentity/userAssignedIdentities/xxxxxxxxxxxx": {
              }
            }
          },
          "kind": "AzureCLI",
          "properties": {
            "azCliVersion": "2.9.1",
            "timeout": "PT30M",
            "scriptContent": "Command1; Command2; Command3",
            "cleanupPreference": "OnSuccess",
            "retentionInterval": "P1D"
          }
        }
      ]
      }

Or the only way is to shape it as a VERY LONG SINGLE LINE?
I'm literally stuck with the problem. Single line deployment scripts are very useful anyway, but they look horrible! For the classical arm json template + parameters json file + deployment using New-AzResourceGroupDeployment cmdlet, multiline scripts work just fine, BUT for arm json templates inside the blueprint, I couldn't make it working.