How to evaluate the variable in the SQL Code Editor

[jayachandra21]

Created a RunSQLOptionsProvider for SQL Editor.

internal class RunSQLOptionsProvider: CodeEditorOptionsProviderBase
{
    protected override string GetLanguage(PropertyInfo propertyInfo, object? context) => "sql";
}

Created a custom activity with input parameter as below

[Input(UIHint = InputUIHints.CodeEditor, Description = "Enter the Database Command Text", UIHandler = typeof(RunSQLOptionsProvider))]
public Input<string> CommandText { get; set; } = new("");

In the Workflow designer I have created a variables and using in the Sql Editor

While evaluating the expression getting the following error

Is there a way to evaluate an expression if there any workflow variable?