It is possible to develop firmware for BlueNRG-2 on System Workbench for STM32?
Document UM1873 describes how to generate a cubemx project for the bluetooth module X-NUCLEO-IDB05A1
On this expansion board is a SPBTLE-RF module.
There are so many bluetooth modules it is not clear if this is the same as BlueNRG-2 Also announced a year ago is the STM32WB but still not available. The WB is selectable in Cubemx but cannot generate a project.