From a performance aspect i would not use objects to retrieve the data, but use SQL.

SQL will take care of the conversion for you.

e.g.

select PAADM_PAPMI_DR->PAPMI_PAPER_DR->PAPER_StName
from SQLUSer.PA_Adm
where
PAADM_Hospital_DR = 2
and
PAADM_AdmDate>='19/03/2025'
and
PAADM_AdmDate<='19/03/2025'

In addition, here is the intro course from learning https://learning.intersystems.com/course/view.php?id=1130