Can you easily integrate with externals systems via REST & SOAP? I've done some quick web searches on this topic and have never seen anything that jumped out at

Can you easily integrate with externals systems via REST & SOAP? I've done some quick web searches on this topic and have never seen anything that jumped out at me. I know Google Sheets gives you a little bit of this with Javascript embedding but I was searching for something more tightly integrated with Excel or LibreOffice.