The chosen two stories from that trial read list with 40ch(60 before) has normally had most power stones in the first few weeks after chosen, so they have been usually on top 20 for some time, so on PC i can only find new chosen ones by using PowerRanking, even if you miss it for two weeks, they likely still there
https://www.webnovel.com/ranking/novel/monthly/power_rank?rankName=Power&timeType=3&sourceType=1&sex=1&signStatus=0
they have now, what next in front page, which lists chosen books to continue MTL, but if you miss it for few weeks, use link above.