How to use?
  1. In your Excel worksheet, select a range like f.i. $A$1:$H:$25 (first row need to contains column's headings).
  2. Press CTRLC
  3. In this form, click in the text area here below
  4. Press CTRLV

The copied data will be immediately converted to a markdown table and a HTML preview will be rendered.

Adjust the markdown syntax if needed and copy/paste into your notes.

Demo