Hi, I developed a code autocompletion plugin for Jupyter Notebook based on TabNine which provides code auto-completion with deep learning. Equipped this will make you more productive, Welcome to use:) https://github.com/wenmin-wu/jupyter-tabnine
Yes it is possible to use intellisense and autocomplete in Jupyter Notebook.
No matter how good you are in programming with respect to a language like python you may not be able to remember all the functions names or syntax or function parameters. So you may require to use intellisense or autocomplete feature of Jupyter notebook while programming in pandas, python and similar libraries.
I found a good explanation here.