Cannot pass argument to struct method

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Expected Behavior

{{ 'email' | errors.Get }}

Actual Behavior

syntax error in \"'email' | errors.Get\"

Detailed Description

I have an errors struct with a Get(string) []string method which I would like to use directly in the template. But I can't manage to pass an argument to that method.
Other methods without an argument work (e.g. Key() []string).