This bug may be more appropriate in the linux project.
They already make a linux-source-5.4 package.
https://launchpad.net/ubuntu/+source/linux
It is provided in Ubuntu 20 repositories. I see no reason why the kernel
would be different between Ubuntu 18 and Ubuntu 20 if it is the same
version.
Additional detail:
source package linux-hwe-5.0 provides binary package linux-source-5.0.0
(130 MB size)
source package linux-hwe-5.4 provides binary package linux-
hwe-5.4-source-5.4.0 (which is almost empty 0.2 MB size)
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