Store delta token to Azure Web Job Application Settings.

I am using delta queries to track the user changes. I have developed an Azure Web job that uses this functionality. 

Now, I need to save the delta token which I got in the last run into Application Settings so, I can reuse it in my next run. My web job runs daily.

Is there any way to programmatically save the value in application settings?

I don't have the right to save the value in Azure Key Vault. 

What are the other options available to save the token and reuse it in the next run?