Return the <PK> after uploading in API

[toushin-taishi]

Hi. First of all, thank you for such a wonderful application.
Is it possible for the API to return the primary key after uploading?
I am just thinking about another use case scenario for paperless-ng wherein it can be a back-end for storing documents, for example, an in-house system for 201 files, medical records, etc.

It's almost perfect to be used for such, as the files uploaded are processed by paperless-ng and yet still physically present in the filesystem.
The API can search, display thumbnail and download. What's missing is the primary key that I can store somewhere as a pointer to the document in paperless-ng.

Is it possible for such a feature to be included in the future releases of paperless-ng? Or is there a workaround to get the primary key after uploading using the API?

TIA and kind regards