Keeping plot outputs in notebook (close, reopen - notebook)

This might be uneducated luck.
But I’m a simple hvplot / panel user.
When I close and reopen a notebook the outputs are all gone and I need to re-execute everything.
I plan on doing nbconvert to get the html out. Is there something I initiate in the first code block once that allows the subsequent cells to render in a way so that when I close and re-open the notebook its still there ?