It was difficult but I have it:

pip install Pillow==9.5.0
pip install --upgrade https://github.com/pklaus/brother_ql/archive/master.zip
brother_ql -b network -m PT-P750W -p 192.168.88.184 print -l pt24 -c /tmp/test.png

Using Brother PT-P750W.

New option

Print a pdf, using LabelWrite400 from DTU. The size is 36mm X 89mm, using linux driver printer-driver-dymo. It prints correctly. In the linux printing options, use system, not chrome, and settings is Large Address, portrait.

Printing on QL-1110NWB

Print it using the system dialog, with the previous page setup.