Import with __input variable as constant type does not work in queries

[italux]

What happened:
I'm building a dashboard template that will be shared with other people and due to limitations of the datasource I'm using (aka grafana-mongodb-atlas-datasource) I can't use template variables. As an attempt to solve this I'm trying to use __inputs variables to allow people to create their own dashboard by inputting specific data using "type": "constant" to replace some partial values inside queries but the replace only work if the query value is exactly matched with the __inputs constant name

This is the __inputs values example

  "__inputs": [
    {
      "name": "MONGODB_ATLAS_DS",
      "label": "MongoDB Atlas Datasource",
      "description": "",
      "type": "datasource",
      "pluginId": "grafana-mongodb-atlas-datasource",
      "pluginName": "grafana-mongodb-atlas-datasource"
    },
    {
      "name": "MONGO_ID",
      "label": "MongoDB ID",
      "description": "",
      "type": "constant"
    }
]

This is the query with partial values that should be replaced

"targets": [
        {
          "alias": "",
          "clusterId": "${CLUSTER_ID}", # This works fine
          "clusterName": "${CLUSTER_NAME}", # This works fine
          "database": "${DATABASE_NAME}", # This works fine
          "dimensionId": "CONNECTIONS",
          "dimensionName": "Connections",
          "disk": "",
          "metricId": "process_measurements",
          "metricName": "Process Measurements",
          "mongoId": "atlas-${MONGO_ID}-shard-00-00.${DNS_PREFIX}:27017",  # This DOESN'T work
          "mongoName": "atlas-${MONGO_ID}-shard-00-00.${DNS_PREFIX}",  # This DOESN'T work
          "projectId": "${PROJECT_ID}", # This works fine
          "projectName": "${PROJECT_NAME}", # This works fine
          "refId": "B"
        },

After import the dashboard we face the query like below:

What you expected to happen:
Be able to replace __inputs values inside queries text strings as shown above

How to reproduce it (as minimally and precisely as possible):
Create a simple dashboard template using the same template example above and try to import replacing constant values inside queries

Anything else we need to know?:
This is the same issue reported in #8923

Environment:

• Grafana version: Grafana v7.0.5 (efbcbb8)
• Data source type & version: grafana-mongodb-atlas-datasource v1.0.0
• OS Grafana is installed on: CentOS Linux release 7.6.1810 (Core)
• User OS & Browser: Mac OS Chrome
• Grafana plugins:
• Others:

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last year. It will be closed in 30 days if no further activity occurs. Please feel free to leave a comment if you believe the issue is still relevant. Thank you for your contributions!

[italux]

Remove stale