This modem was added in v5.11 in https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d6c1ddd938d84a1adef7e19e8efc10e1b4df5034.
We are working on a Kirkstone update that will bring kernel 5.15. Once that is done we can include this modem in the default balenaOS kernel.