Given my project has legacy project fields

INSERT INTO group_desc SET \
group_desc_id='101' , \
desc_required='1' , \
desc_name='project_desc_name:full_desc' , \
desc_description='project_desc_desc:full_desc' , \
desc_rank='10' , \
desc_type='text';

INSERT INTO group_desc SET \
group_desc_id='104' , \
desc_required='0' , \
desc_name='project_desc_name:other_comments' , \
desc_description='project_desc_desc:other_comments' , \
desc_rank='100' , \
desc_type='text';

When I use REST API I do not have a easy way to know how to use this fields in the new project creation REST route

The same issue occurs if I have defined personalized field, I can not retrieve the information I need to use the POST project/ route