Possible to call an additional endpoint after query parameter?

Hi,

I'm relatively inexperienced with the Graph API. I have a query returning a user by using the $search query paramter:

/v1.0/users/?$search="displayName:Test"

This works as intended. However, ultimately, I would like to get this user's manager. So how do I write the query? I tried adding another endpoint (is /manager called an endpoint?):

/v1.0/users/?$search="displayName:Test"/manager

But this throws the error:

Syntax error: character '/' is not valid at position

Is it not possible to do that in one call?

Thanks for your help.