You can not run an x86 distro on a Arm soc, you might be able to run qemu in a docker container with collabora as its done on x86 systems running Arm containers. So I guess the reverse is possible, just the hit from emulation rather than native virtualisation.
Emulation is possible, but I haven’t bothered and it would be slower than you already have.
The document foundation have also released an x86 docker container of LOOL https://wiki.documentfoundation.org/ReleaseNotes/5.3#Public_LibreOffice_Online_Docker_image
The easiest way would be for them to also supply an Arm version.
Also its highly likely the support might be only for 64bit if it ever does turn up as it is for x86.
Its also docker pull libreoffice/online:master but its x86 64bit
I keep thinking an alternative is needed and we need some kind dev to pick up the reigns of the Document app as an alternative parallel offering.