How to access Project DFF to write custom BIP Report?

Summary:

Currently have an OIC integration written to update Projects with a value in descriptive flex fields using API:

/fscmRestApi/resources/11.13.18.05/projects/{projectID}/child/DFF/{projectID}

We want to add this flex field value to a current custom BIP report but I am having trouble finding how to access DFF in Oracle tables. Does anyone have experience with this? I don't see the flex field in PJF_PROJECTS_ALL_B table and am only having luck accessing it through API.

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