'Is it possible to update Environmental Variables for a branch via App Center's API?

Once a build is created on App Center I'd like to clone the build configs environmental variables from another branch, and then update one of the new cloned environmental variables.

I understand I can use the following endpoint to create and clone a branches config

/v0.1/apps/{owner_name}/{app_name}/branches/{branch}/config

cloneFromBranch: <otherbranchname>

However, what's not clear is what endpoint can I use to update the env variables for my new branch.

Here are the App Center API endpoints: https://openapi.appcenter.ms/#/



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