NLog connectionStringName for Azure Worker Role csdef

Question

I'm trying to use NLog with Azure SQL as log DB in order to trace processes in Azure Worker Role.

It works when I set connectionString in NLog.config as below.

<target name="database"
    connectionString=Server=tcp:some.database.windows.net,1433...`
    ...
/>

But I'd like to use connectionStringName given from ServiceConfiguration.csdef which overridden result of App.Config.

App.Config defines connection string as below,

<appSettings>
    <add key="LogConnectionString" value="Server=tcp:some.database.windows.net,1433;..." />
</appSettings>

And, ServiceConfiguration.csdef defines its value to Dev/Test/Live separately.

The NLog throws exception during initialization as below.

---> NLog.NLogConfigurationException: Connection string 'LogConnectionString' is not declared in section.

Note that, Adding providerName in App.Config did not help. It seems that providerName property does not propagate to csdef configuration.

Can I achieve this without SlowCheetah config transform?