Can you upload an appendix externally for referencing?
I routinely use the Open Science platform (see https://osf.io/) for things like model code, simulation results, data dictionaries, supplementary figures and all the other extraneous materials that are needed for reproducing results. I haven't submitted to IEEE but I have had no problem with any of the journals I do submit to.

The way it works is that you upload the material and create a registration (a snapshot or archive) which is public and cannot be changed. I typically leave the project open until the final draft and then create the registration. That registration will have a URL which I then include in the edits.

There are many such repositories, some field specific. Nature has a list of places for archiving data at https://www.nature.com/sdata/policies/repositories with comments about what can be stored there.