Alias interfaces by adding an environment parameter as a condition in services.yaml

I have two repositories implementing the same interface.

1. App\Repository\RepoA
2. App\Repository\Legacy\RepoA

I also have added the USE_LEGACY env variable(as a parameter in the services.yaml as well):

parameters:
    use_legacy: '%env(bool:USE_LEGACY)%'

What I wanna achieve is, if USE_LEGACY is set to true the interface when called will call the repository from legacy, if not, it will call the other(non-legacy) repository.

So far I tried:

services:
      App\Repository\Interface\RepoAInterface: 
        alias: '@=service("App\Repository" ~ (parameter("use_legacy:") == false ? "\\RepoA" : "\Legacy\\RepoA"))'

But this is not working. Is there any solution?

FYI, I'm using Symfony 6.4 and PHP 8.3

Use factory class to dynamically build services:

services:
   App\Repository\Interface\RepoAInterface:
       factory: '@App\Factory\RepoAFactory'
       arguments:
           - '%use_legacy%'

use App\Repository\RepoA;
use App\Repository\Legacy\RepoA as LegacyRepoA;
use App\Repository\Interface\RepoAInterface;
use Symfony\Component\DependencyInjection\Attribute\AutowireLocator;
use Psr\Container\ContainerInterface;

class RepoAFactory
{
    public function __construct(
        #[AutowireLocator([
            RepoA::class,
            LegacyRepoA::class,
        ])]
        private ContainerInterface $locator,
    ) {
    }

    public function __invoke(bool $useLegacy): RepoAInterface
    {
        return $useLegacy === true
            ? $this->locator->get(LegacyRepoA::class)
            : $this->locator->get(RepoA::class);
    }
}