Oh, you’re right, it’s not there. I’ll also miss that key 
I see some posts that also complain about that. Exemple: Custom Fn key combinations?
A solution could be to use QMK to create that key using layers.
I don’t know how that works though as I don’t have a framework laptop 
Off-topic question: I don’t know anyone who’s visually impaired, may I ask if you’re using a screen reader to navigate the forum ?
EDIT:
It seems that you can configure the keyboard directly through a web interface from Framwork: https://keyboard.frame.work/ (I couldn’t test myself, so I cannot guide you through the procedure)
If you are using Firefox like myself, you might want to install Ungoogled Chromium to access the above web interface, as Firefox doesn’t support direct connection to USB devices (Yes, the Framework keyboard, at it’s core, is a USB device) . You can download Ungoogled Chromium here: Downloads for ungoogled-chromium