the LDRAW Wiki mentions how you can add custom parts to studio:
https://wiki.ldraw.org/wiki/How_To_Add_U...ink_Studio
I did not try that myself yet. Maybe the info there helps you and/or you can update the information?
https://wiki.ldraw.org/wiki/How_To_Add_U...ink_Studio
I did not try that myself yet. Maybe the info there helps you and/or you can update the information?