Use of STRING_AGG in Postgresql

Question

Good afternoon friends,

I used the script below:

SELECT id_docent
, STRING_AGG(distinct no_municipio, ' / ') AS "Municipios" FROM public tb_uf INNER JOIN public.ts_docent ON (tb_uf.co_uf = ts_docente.co_uf) AND (tb_uf.co_municipio = ts_docente.co_municipio)
GROUP BY id_docente

That gave me the result:

I would like to know if there is a command that tells me which dependency on municipalities, so:

Thanks for your attention.