Super resolution has been in ACR in Photoshop for many months (since March) now, but it is finally directly in LR
Have you tried the Abobe ACR Super Resolution yet? It is awesome! It increases the pixel count 400%. Enhance allows you to increase image quality for making large prints or increasing the resolution of a cropped image. It is coming to Lightroom "soon" (soon is Adobe's timeframe, stated in March), but for now, right click, edit in, open smart object in Photoshop which will open the file in ACR).
I compared Abobe ACR Super Resolution to Topaz Gigapixel, which I have used in the past and it works, but it is clunky and slow. Workflow wise Topaz Gigapixel does not interpret RAW files well, so I have to open the file in ACR and save it as a TIFF and then open it in Topaz Gigapixel, takes a while to process. See our comparisons below.
From Julianna Kost https://jkost.com/blog/2021/06/lightroom-classic-10-3-support-for-apple-silicon-premium-presets-super-resolution-and-more.html
• In the Develop module, choose Photo > Enhance or, right-click in the image (Control -click on Mac) and choose Enhance to display the Enhance Preview dialog.
• Applying Super Resolution automatically enables the Raw Details feature to create the highest quality image possible when working with raw files.
• Any adjustments made to the source photo will automatically be carried over to the newly created, enhanced DNG.
• While you can’t apply Super Resolution multiple times to the same original, you can apply Super Resolution and then enlarge the image further when exporting or, within another application such as Photoshop (using the Image Size command).
To learn more about how Super Resolution works, check out this post by Eric Chan https://blog.adobe.com/en/publish/2021/03/10/from-the-acr-team-super-resolution.html#gs.4grl9h