AWS Managed Grafana - Missing Account Selector for EC2 and EBS Queries

[DT-NIKOLAR]

What happened:
When using AWS Managed Grafana with cross-account CloudWatch access, the EC2 Instance Attributes and EBS Volume IDs query types in dashboard variables do not provide an account selector. This causes errors when trying to query resources from accounts other than the monitoring account:

Error updating options: Unexpected token 'u', "unexpected"... is not valid JSON

What you expected to happen:
To be able to select Account for the EBS Volume ID and EC2 Instance Attributes

How to reproduce it (as minimally and precisely as possible):

1. Configure AWS Managed Grafana workspace with cross-account CloudWatch access
2. Create a new dashboard or navigate to an existing one
3. Go to settings > variables
4. Create a new variable
5. Variable type: Query
6. For Query Select EC2 Instance Attributes or EBS Volume IDs

Screenshots

Anything else we need to know?:

Environment:

• Grafana version: AWS Managed Grafana v10.4.1
• Plugin version: N/A
• User OS & Browser: Linux/Chrome