SELECT jsonb_agg(val) from
(
SELECT to_jsonb(sss.idm)||to_jsonb(sss.pu)||to_jsonb(sss.usr) FROM
(
SELECT distinct on (p.nus, t.nto) m.idm, p.usr as pu, k.usr
	                FROM public.mal m
                    INNER JOIN public.aus p ON m.fko = p.fki
	                INNER JOIN public.aus k ON m.fkk = k.fki
                    INNER JOIN public.ato t ON m.fkt = t.nto

WHERE fko = 51 AND k.fki = 130 OR p.fki = 130 AND fkk = 51 
ORDER BY p.nus, t.nto DESC
) as sss 
order by idm ASC
) as x(val)
;

SELECT jsonb_agg(sss.idm||','||sss.pu||','||sss.usr order by idm ASC) FROM
(
SELECT distinct on (p.nus, t.nto) m.idm, p.usr as pu, k.usr
	                FROM public.mal m
                    INNER JOIN public.aus p ON m.fko = p.fki
	                INNER JOIN public.aus k ON m.fkk = k.fki
                    INNER JOIN public.ato t ON m.fkt = t.nto

WHERE fko = 51 AND k.fki = 130 OR p.fki = 130 AND fkk = 51 
ORDER BY p.nus, t.nto DESC
) as sss
;

with step1 as 
(
SELECT 
  --distinct on (p.nus, t.nto) 
  jsonb_array_elements(jsonb_array_elements(jsonb_agg(
  to_jsonb(m.idm)||to_jsonb(p.usr)||to_jsonb(k.usr)))) as item
  FROM public.mal m
  INNER JOIN public.aus p ON m.fko = p.fki
  INNER JOIN public.aus k ON m.fkk = k.fki
  INNER JOIN public.ato t ON m.fkt = t.nto

  WHERE fko = 51 AND k.fki = 130 OR p.fki = 130 AND fkk = 51
  --order by p.nus, t.nto DESC
) 

select jsonb_agg(item)
  from step1
;