You can install direct from Chrome Web store without using third party websites. Any of available extensions can be used in Microsoft Edge Chromium.
After installation, Chrome extensions work fine in Microsoft Edge Chromium.
How To Add Chrome Extensions Into Edge Chromium?
By default, Add to Chrome button will not show up in the Chrome web store website when you visit an extension link to install your desired extension from Chrome web store.
You need to turn on an option to make Chrome web store reveal Add to Chrome button for installation.
To turn this option on, Click on the settings button with a horizontal ellipsis symbol.
You will find this option on left down side in Microsoft Edge Chromium. Turn it on.
Your copy of Microsoft Edge Chromium is now ready to install Chrome extensions.
In this tutorial, Team Software Geek and SofSuggster has tried best to explain everything very well, But If you still run into any problem or have any question, Please do let us know using the comment section, Team Software Geek will try to solve your problems.