1. Save the .dng file to the Creative Cloud, Dropbox, Google Drive. Anything you want to use.
2. Open the Lightroom app. I have made a folder for presets, so it’s easy to find all your downloaded presets there in the future.
3. In the album, click the three dots in the right corner -> Add photos -> From Files ->
You should get opinions where you could load the files. As I use Creative Cloud, I click that. Then just click the ones you want to download.
4. It should show DNG in the right corner in the photo.

Then it’s ready to use! Just copy the settings from it, or create preset from it. It would be easier to use if created a preset, so you won’t need to search it always!