Azure Functions独立工作者模式下如何绑定触发器参数到appsettings.json

在进程内函数模式中，可将appsettings.json作为自定义配置源，用来解析触发器参数。示例如下，TimerTrigger可从appsettings.json中读取ScheduleTriggerTime参数：

[FunctionName("Function1")]
public async Task Run([TimerTrigger("%ScheduleTriggerTime%")]TimerInfo myTimer)

迁移至独立工作者模式后，发现无法从appsettings.json绑定参数，仅能通过local.settings.json实现。已将appsettings.json添加至配置，尝试从中获取TimerTrigger的ScheduleTriggerTime设置，但启动应用时抛出错误：

Microsoft.Azure.WebJobs.Host: Error indexing method 'Functions.Function1'. Microsoft.Azure.WebJobs.Host: '%ScheduleTriggerTime%' does not resolve to a value.

相关代码 #

Program.cs

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;

var host = new HostBuilder()
    .ConfigureFunctionsWebApplication()
        .ConfigureAppConfiguration((hostContext, configurationBuilder) =>
        {
            configurationBuilder
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile($"appsettings.json")
                .AddJsonFile($"appsettings.{hostContext.HostingEnvironment.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();
        })
    .Build();

host.Run();

Function1.cs

using Microsoft.Azure.Functions.Worker;

namespace FunctionApp4
{
    public class Function1
    {
        [Function("Function1")]
        public void Run([TimerTrigger("%ScheduleTriggerTime%")] TimerInfo myTimer)
        {
        }
    }
}

appsettings.json

{
  "ScheduleTriggerTime": "0 */1 * * * *"
}

请问这是独立模式下的有意变更，还是我遗漏了某些配置步骤，导致无法从appsettings.json解析参数？

内容的提问来源于stack exchange，提问作者Samuel