If you maintain upstream software and do not have an interest in learning and using Nix, please don’t put the burden of packaging software in Nix onto yourself. Nobody in their right mind would expect you to package anything for a dozen distros; that’s not how distros are supposed to work.
Leave it to someone who is interested to package your software in Nixpkgs. Your “job” is to make your software better and provide a sane way to build your software that packagers can rely on (i.e. no assumptions where things are or are supposed to go, document your dependencies and build processes).
If you do want to go the extra mile, offer your help in assisting packaging in the appropriate channels. You know the technical details of your software and Nix users how Nix packaging works but the reverse mostly isn’t true, so cross-pollination can be super helpful here.
Even just things like testing that your software works as you expect when the packaging is touched in some way (i.e. an update) is incredibly helpful. (If saw a package update PR with the upstream maintainer’s approval stating that it works as they expect, I’d merge immediately.)
If packaging for Nix is a burden for you, please just open an issue on Nixpkgs with links to your packaging/build documentation and let someone else do it for you.
As a Nixpkgs committer, I’d much rather have someone invested in Nix build and maintain a package than an upstream maintainer who somehow feels obligated to do so but has no experience or actual interest as the former is more likely to produce good code and keep maintaining the package.