VHDL How to get attributes value reported to user?

Code VHDL - [expand]
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type t is (a, b, c, d, e);
subtype s is t range D downto B;

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type row_array_t   is array(0 to 3) of BYTE_T;
type matrix4x4_t   is array (0 to 3) of row_array_t; -- alternatively col_array_t
--
      for i in matrix_in(row)'range loop
        for j in matrix_in(col)'range loop
            matrix_out(i)(j) <= sub_byte_s_box1(matrix_in(i)(j));
        end loop;
      end loop;

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type tVecVecByte is array (natural range <>, natural range <>) of
    std_logic_vector(7 downto 0);
signal matrix_in is tvecvecByte(0 to 3, 0 to 3);
 
--Therefore 
for I in matrix_in'range(1) loop
for I in matrix_in'range(2) loop.

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type t_arr_t is array(integer range <>) of t;
 
function to_string(a : t_arr_t) return string is
  variable ret : string(1 to a'length);
  alias a_a : t_arr_t(ret'range) is a;  -- do this for arrays that dont start at 1 etc
begin
  for i in a_a'range loop
    ret(i) := a_a(i)'image;
  end loop;
 
  return ret;
end function to_string;