Rename or remove a key ending with a backslash

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I have Symfony YAML configuration file:

services:
    _defaults:
        autowire: true
        autoconfigure: true
        public: false

    App\:
        resource: '../src/*'
        exclude: '../src/{DependencyInjection,Entity,Migrations,Tests,Kernel.php}'

    App\Controller\:
        resource: '../src/Controller'
        tags: ['controller.service_arguments']

I would like to refactor the App\ key to Foo\App\ and likewise App\Controller\ to Foo\App\Controller\, but none of the following works:

yq '.services["App\\"]' test.yaml
yq '.services.["App\\"]' test.yaml
yq '.services["App"]' test.yaml

The only selector that worked is using a wildcard, but this could also select AppBar\.

yq '.services["App*"]' test.yaml

yq version 4.27.2

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Just found it in the docs: https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#special-characters-in-strings

key="App\\" yq '.services[strenv(key)]' test.yaml works as intended