There is a community spreadsheed for the FW12 specifically: Framework 12 USB-C Charging data - Google Sheets
Source: https://community.frame.work/t/framework-12-usb-charging-database-your-help-needed
Personally use the Anker Nano World Travel adapter when travelling internationally - for it’s small footprint and versatility - which only provides 20W. It does work without a problem.
Generally use 45W or more everyday though.