How do you set the default output format for a PowerShell Cmdlet?

I'm creating a PowerShell Cmdlet in C# to read fields from a JSON file and output some objects. The objects are a simple POCO type:

public class FieldDefinition
{
    public FieldDefinition(string name, TypeCode code)
    {
        Name = name;
        Code = code;
    }

    public string Name { get; }

    public TypeCode Code { get; }
}

When writing the output, the entries are presented as:

PS ~Debug> Get-Field

Name : Session
Code : Int64

Name : Instance
Code : String

Ideally, I want the default presentation to be as a table:

PS ~Debug> Get-Field | Format-Table

Name     Code
----     ----
Session  Int64
Instance String

When I call commands like Get-Process, I am always presented with the table format. How can I make my command present its output as a table?