I'm not aware of any tools that offer the ability to easily get subscribers for a particular community other than what you can see on peakd or something similar. With that said, the easiest way to get a list of subscribers would be to make an API request and do this yourself depending on what format you wish to have them in. This depending on your technical abilities. If you'd me to provide you with more details on how to do this, more than happy to help 👍