Unfortunately I doubt that it is possible to use regular bluetooth dongle for that. At least it did not work that way several releases ago for me with a bluetooth dongle which was working with Webui.
Also here Connecting a Bluetooth Midi device to a dwarf with bluetoothdongle - #2 by falkTX
@FalkTX mentions that it is not supported. Last reliable news in that thread are dated with Feb 2022 and bluetooth midi had not been yet supported at that moment due to old bluez stack.
Hope one day it would be implemented.
What you can use in your case is a dedicated bluetooth-midi dongle, it would look like a regular usb-midi device from the MOD device stand point, not different from connecting a usb midi keyboard for example, all the bluetooth wirless stuff would be handled by the dongle itself.
M-VAVE MS-1 dongle (from that same vendor who makes Chocolate) worked fine to connect my Chocolate and I used it for a several month to send CC signals to control pedalboard, before switching from Chocolate to Softstep.
( Did not work with Artiphon Orba2 though)
I also recall discussing more expensive but probably more easy to get CME WIDI dongles in the Chocolate thread MIDI "Chocolate" 🍫 controller with the Mod Dwarf, an introduction but i do not remember if they work fine with that controller. UPD: CME does not work with chocolate, according to the thread.