Symfony 4，如何在构造函数中注入服务并传递另一个参数？

From an Utils service class, I need to get an argument I defined in the services.yaml.

And when I want instantiate my service class, I want pass a 'non service' parameter.

Currently, I have :

#from my services.yaml
...
services:
    ...
    App\Utils\myCustomService:
        arguments:
            $foo: 'some value'


//from my custom service 
...
private $faa;
private $foo;
public function __construct(ParameterBagInterface $foo)
{
    $this->foo = $foo;
}
public setFaa($value){
    $this->faa = $value;
}

//from a custom Controller by example
...
public function new(myCustomService $myCustomService){
    $myCustomService->setFaa("blabla");
    ...
}

But I'm looking for a way to use the "new" method in my Controller like this :

//from a custom Controller v2
...
public function new(){
    $myCustomService = new myCustomService("blabla");
    // and the parameter "faa" in $myCustomService is automatically set to "blabla"
    ...
}

With this "new" method, I get an error because the constructor of my custom service Class neen only one parameter of type "ParameterBagInterface".

I think I must change things in my custom Service Class, but I don't find what, someone can help me ?