Unfortunately, I hadn't gotten a straight answer on this one (out-of-the-box access to normal, telephoto, and wide angle cameras). Just in case someone else is wondering: No. The answer of @lobotomize provided me the right search terms and I found below solution requiring root.
I decided for myself to stay with Stock ROM for now as it will still receive updates for 1,5 years and is not the worst regarding GUI and so on.For anyone lineage w/o the google, there is a gcam with working lenses (wide/normal/telephoto) with root. Assuming you're on this rom:
1. Get the "Gcam Services Provider" here to enable gcam without google:
GitHub - lukaspieper/Gcam-Services-Provider: App faking only the absolute necessary Apis to use Gcam without Play ServicesApp faking only the absolute necessary Apis to use Gcam without Play Services - GitHub - lukaspieper/Gcam-Services-Provider: App faking only the absolute necessary Apis to use Gcam without Play Ser...github.com
2. Get the 7.3 Gcam, and also the xml by Wichaya here:
(7.3 as the link in #1 needs an older version)These are stable Google Camera versions compatible with the OnePlus 7 family of devices released in 2019: OnePlus 7 OnePlus 7 Pro OnePlus 7T OnePlus 7T Pro OnePlus 7T Pro 5G McLaren These recommended versions are based on the work of the telegram group for this phone. Props to Sir Tavares...www.celsoazevedo.com
3. Flash the Magisk fixes @ #2 page. There are 2 fixes. Wasn't sure but I flashed them both in magisk.
4. Open gcam, double-tap near the take-photo button, and load the xml you downloaded in step 2.
I just did this tonight. Have not played around with photography, but at least we get all the lenses on the 7T for those of us without gapps ! Works on this fantastic ROM !!!