I found the JSON files for the Andromeda skin (80021_harem-job and 80022_harem-job) by adding 10 to the number in the Lancelot skin's JSON files (80011_harem-job and 80012_harem-job) rather than buying the premium pass. I used the script in post #612 and replaced the default downloading code with the following:
url = 'https://r.kamihimeproject.net/v1/scenarios/80021_harem-job'
r = requests.get(url, headers=headers, verify=False)
open('80021_harem-job.json', 'wb').write(r.content)
url = 'https://r.kamihimeproject.net/v1/scenarios/80022_harem-job'
r = requests.get(url, headers=headers, verify=False)
open('80022_harem-job.json', 'wb').write(r.content)
This method to obtain future soul skins might keep working until the increment is a number other than 10.
Edit 1: Updated to include the JSON files for the DMM soul skin Solomon [Wisdom Librarian]. The previous DMM soul skin, 2 kamihime skins, Main Quest 17, and Main Quest 18 are on post #611.
Edit 2: Updated to include the JSON files for the DMM soul skin Shingen [Bright Sake Master].