There is an example in the Electron Demos App. It is "Print to PDF" but would work the same with print.

To only print a specific section I see two solutions:

• The easy way is to blend the unnecessary parts out with a CSS selector:

@media print {
  .no-print {
    display: none;
  }
}

• The harder way is to export the content of the section to a new hidden window and print that window. In this solution, you have to build a proper template to include your section.