Page limit for IEEE JBHI (including reference or not)
From the editor office,

Is the 8-page limit with or without the references and biography section?
The page limit includes the references. The biography section is not required.
Is it possible to include supplementary materials in the paper? If yes, will it be considered in the page limit?
It is possible. However supplementary material is added at the end of your manuscript (after the references section) and is included in the page limit.