How to infer type for method completion?

[Slamdunk]

Hi, implementing a custom \Phpactor\WorseReflection\Core\Inference\FrameWalker I've been able to infer a custom type to a variable during assignment:

/** @var MyContainer $container */

$foo = $container->get(MyService::class);
<> // $foo is now MyService just like I need it to be

Now I'm looking for doing the same at direct call level:

/** @var MyContainer $container */
$container->get(MyService::class)-><> // MyService ordinary completion should pop up

But I fail to understand the proper way to do it.
I've dug into FrameWalker and also WorseClassMemberCompletor: I don't need to create a custom properties/methods list, I'm just looking for inferring MyServce type as the return type of the get method.

Any help or hint would be lovely welcomed.