Based on this tutorial by jbMacAZ on forums.manjaro.org
Made on 26/05/2020 for the Asus t100ta and Manjaro 20.0.1
These instructions should work for any 32bit EFI / 64bit CPU system, but I only tested it on the Asus t100ta, use at your own risk.
I tested the community editions for Budgie, Gnome and LXQt, but this tutorial should be good for any 64bit Manjaro edition.
I'm using vanilla Ubuntu 20.04, you will need gparted and unetbootin for this tutorial.
You will also need a 4GB or more USB stick which data will be wiped.
If like me your t100ta dock is broken, you can charge the computer normally until full, then use the charging micro-usb port to have an OTG cable + USB hub to connect the USB stick, a keyboard and a mouse.