All edge drivers, stock or custom, run on an Aeotec hub. That’s how the SmartThings edge architecture works.
It sounds like you might find the community FAQ helpful:
FAQ: I have no idea what Edge is. Is that a new developer tool? (2022)
As far as having Alexa make announcements, if you have a specific announcement that you want to make for a specific trigger, that’s a very popular use case. Here’s the community FAQ for that.
FAQ: Can I trigger an Echo Action without Speaking to It?
However, that method does not allow for any kind of variable. So for example, you could use that method to have one Alexa routine announce “Mary is home” when Mary arrives home and a different Alexa routine announce “Michael is home” when Michael arrives home. But you couldn’t set up just a single Alexa routine to make a differently worded announcement based on which of those specific presences is detected. So it comes down to the details of what you were trying to do.
I suggest you start a new thread in the automation ideas area of the forum and describe exactly what you would like to do and then people should be able to help you.
It will be helpful for you to indicate what country you are in as some of the Amazon features do vary by region. And make sure you mention in your first post that you do have the Aeotec hub.