I don't disagree with Ranjisha's advice about where to post new ideas and feature requests, but I don't understand your question. LR Mobile does have support for the 2X "tele" lens on that device, and is able to capture DNG, HDR, and JPG images with that lens. Are you really asking about the ultrawide lens? If so, LR Camera can only capture JPGs, because Apple hasn't made it possible for app like LR to do DNG capture with that lens. You'd have to use the native camera instead.
When I tap the little lens icon I get: W, UW, and T which makes perfect sense since the iPhone 14 Pro has three lenses. But, Apple built some sort of "magic" (pixel-binning?), I believe, utilizing the 48 megapixels of the Wide lens to essentially provide a 2x lens. Therefore, in the native Apple camera app you have a 0.5, 1x, 2x, and 3x lenses. Other third-party apps such as Halide and ProCamera also enable this 2x lens in addition to the three physical lenses. Therefore, in the native camera app and those third-party apps I mentioned you get 4 lenses. I don't see where LR Mobile's camera allows for the 2x lens. If it's there, please let me know how to access it.
I appreciate your follow-up/correction. You are correct. I had forgotten that the iPhone 14 Pro Max tele lens is a 3X and not 2X lens. And you're right that the current LR Camera design doesn't expose the 2X option, which is apparently some sort of sensor crop image. I'll ensure a ticket is logged with the engineering team to ask for this, but I can't comment on if/when this functionality might be implemented.
Thanks again for your post!
[Edit: converting this post to an Idea, to help track internally as a feature request]