PhpStorm: Language Injection Prefix Follow

What I'm trying to do is have a string in a function parameter be treated as a SQL relation (table or view):

$result = selectFromTable('public.users');

So, what I did was created a Language Injection with the following "Place Patterns":

+ phpFirstArgument(phpWithName(string().oneOf("selectFromTable")))

I then set the language to PostgreSQL, and set "Prefix:" to: (no quotes)

"SELECT * FROM "

And... while it does pickup that SQL should be used in the first argument, it doesn't take into account the Prefix value and asks me to enter a statement...

What did I do wrong? Is it possible to do this?\

Bonus points: How would you do this for a column? example code: (see first parameter of DB->where())

$result = (new DB('public.users'))->where('username', '=', 'john.doe')->select();