Conditionally using FOR JSON PATH in stored procedure

I would like to create stored procedures that conditionally output JSON based on an input parameter. Can this be done without having to duplicate the select statement?

CREATE PROCEDURE myProcedure @outputJson bit 
AS
BEGIN

        IF outputJson = 1
        BEGIN

            SELECT col1,
                   col2,
                   col3
              FROM dbo.MyTable 
               FOR JSON PATH    

        END
        ELSE
        BEGIN

            SELECT col1,
                   col2,
                   col3
              FROM dbo.MyTable 

        END

END
GO

You can use use dynamic sql to include the "FOR JSON" clause based in the parameter.

CREATE PROCEDURE dbo.myProcedure @outputJson bit
AS
BEGIN
    DECLARE @sql nvarchar(max) = N'SELECT col1, col2, col3 FROM dbo.MyTable';

    IF @outputJson = 1
    BEGIN
        SET @sql += ' FOR JSON PATH';
    END

    EXECUTE sp_executesql @sql;
END
GO