Have you ever used Google Scholar (https://scholar.google.com/) to find medical research information? What's nice about it is the sort by year function for the search results to get the latest research information on treatments being used. I did a search for EGPA and it came up with a good sized list:
https://scholar.google.com/scholar?as_vis=1&q=egpa+treatment&hl=en&as_sdt=1,24&as_ylo=2020

Hi Roxy, i too have been diagnosed with Churg Straus and am on the Nucala regiment as well. It has helped lower my EOS numbers and my breathing treatments have been good lately. Having more blood work and a CT scan this month. I have also been told there is not a lot of information on this. I too, have things that pop up and always wondering if it is part of the CS or something else I should be checking. It is frustrating. I am just going on the thought that as long as my blood work is good and I can breathe, it is a good thing.

I have Churg Straus also and was put on Nucala as well. However within 12 hours of taking Nucala my lower legs broke out into small and medium lumps that were all very painful and some turned into open sores while others truned into large painful red rashes. There were so many I couldn't count. My arthritis doctor was stumped as to what or why I got these lumps. I was on Nucala for 3 months when we decided to take me off of it. I think my breathing did improve during that time but the pain from the lumps has disrupted my life so much that It wasn't working. I canot sleep because just having a blanket or sheet resting on my legs was painful. I describe the lumps as small volcanos of nerves.
I'm wondering if anyone else has these lumps/lesions/sores?