Please check https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/implementing/deploy...
Environment-specific values, which are values that vary between Development environments, and thus cannot be accurately targeted by run mode (since there is a single dev runmode in Adobe Experience Manager as a Cloud Service). For example:
{
"url": "$[env:server-url]"
}
Note that a single OSGi configuration file can use any combination of these configuration value types in conjunction. For example:
{
"connection.timeout": 1000,
"api-key": "$[secret:server-api-key]",
"url": "$[env:server-url]"
}
Arun Patidar