Shimano XT CS-M8000 Cassette 11-40t , 11-42t , 11-46t for sale online | eBay
First Look: Shimano Brings Electronic Di2 Tech Down to Deore XT, Adds Wireless Connectivity and 11-46 Cassette Option - Mountain Bike Feature - Vital MTB
GRX 812 with 11-46 cassette is no problem : r/DivergeGravelBikes