Just took a couple minutes to install and setup the fork to try it out. Turns out there is a flatpak on Flathub under the id dog.unix.cantata.Cantata that looks to be maintained directly by nullobsi. I’ll have to see where rough edges show up, but this fork looks good thus far. A full port from Qt5 -> Qt6 isn’t a trivial amount of effort, so mad respect to everyone working on this ported version.
I know ArchLinuxArm (a fork of the ArchLinux project) supports the Hisense C11. It does seem to be a fairly involved procesd, and (potentially?) requires using external media rather than the onboard eMMC storage to boot a Linux system.
Your particular Chromebook contains the same SoC (Rockchip RK3288) as an Asus C201, which Debian has an install guide for. Once again, a fairly involved process and this one may not be guaranteed to work if the C11 has some quirks not present in the C201.