Use Nvidia GPU for primary monitor and onboard Intel GPU for secondary monitor

Actually I'm using 2 Monitors on the Nvidia GPU and would like to use a third on the Intel GPU, because I got no suitable port left on the Nvidia GPU. I just thought this title would be easier to find for others.

inxi -Fx

System:  Kernel: 5.4.52-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.1.0 Desktop: KDE Plasma 5.19.3 
           Distro: Manjaro Linux 
...
Graphics:  Device-1: Intel HD Graphics 630 vendor: Gigabyte driver: i915 v: kernel bus ID: 00:02.0 
           Device-2: NVIDIA GP104 [GeForce GTX 1080] vendor: Micro-Star MSI driver: nvidia v: 440.100 bus ID: 01:00.0 
           Display: x11 server: X.Org 1.20.8 driver: nvidia resolution: 1920x1200~60Hz 
           OpenGL: renderer: GeForce GTX 1080/PCIe/SSE2 v: 4.6.0 NVIDIA 440.100 direct render: Yes 
...
xrandr

Screen 0: minimum 8 x 8, current 3840 x 1200, maximum 32767 x 32767
DVI-D-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 1920x1200+1920+0 (normal left inverted right x axis y axis) 582mm x 364mm
   1920x1200     59.95*+
   1920x1080     60.00    59.94    60.05    60.00  
   1680x1050     59.95  
   1600x1200     60.00  
   1280x1024     75.02    60.02  
   1280x720      60.00    59.94  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080     60.00 + 144.00*  119.98    99.93    59.94    50.00  
   1680x1050     59.88  
   1440x900      59.90  
   1280x1024     75.02    60.02  
   1280x720      60.00    59.94    50.00  
   1024x768     119.99    99.97    75.03    70.07    60.00  
   800x600      119.97    99.66    75.00    72.19    60.32    56.25  
   720x576       50.00  
   720x480       59.94  
   640x480      119.52    99.77    75.00    72.81    59.94    59.93  
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)

So, as you can see, the hardware seems to be detected correctly, but it is not set-up correctly with X11. I tried to add a file

cat /etc/X11/xorg.conf.d/40-onboard-gfx.conf

Section "Device"
  Identifier "Onboard"
  Driver "intel"
  Option "AccelMethod" "uxa"
  # Option "TearFree" "true"
  BusID "PCI:0:2:0"
EndSection

But that did not seem to help. Unfortunately, I just don't seem to find the correct keywords to search for. Therefore, any clues are highly appreciated. Thank you.

Update: I "solved" the problem by buying a 6€ DisplayPort-to-HDMI adapter.

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