Using classic Outlook for Windows in educational settings
It's there, but it's not great by default. Go to "Help" and search for "quick parts". You'll be instructed to make a template from the My Templates option under Apps in the Insert Ribbon-tab. Also not useful is that the help menu is likely to cover the My Templates.
I'm still looking for a way to assign a keyboard shortcut or a quicker way to access the snippets that I'm happy I found.
Another option is to find a system app that supports snippets. I'm waiting on a amazing productivity Mac apps such as Raycast to come to Windows. This means you can insert a snippet anywhere where your cursor is. Windows may already have a feature like this, I'm unaware.