If you do not have an SD card and wiped your internal storage, you can stream the file from a PC.
The popular OpenGApps project stopped official releases for Android 12L. However, you can find from community members.
Historically the most popular choice, OpenGApps faced delays in providing automated builds for Android 12.1. While some unofficial builds exist, they are not recommended unless specifically listed for your version. How to Install GApps on LineageOS 19.1 gapps for lineage os 191 link
On your PC, run: adb sideload lineage-19.1-xxxxxxxx-nightly-device-signed.zip . :
MindTheGapps is essentially an "all-in-one" package that includes the core Google services, the Google Play Store, and a few baseline Google apps. If you do not have an SD card
Comparing Android alternatives: Lineage OS, ∕e ... - Kevin Boone
Hold down the (or your device's specific key combination) to boot into custom recovery (Lineage Recovery or TWRP). Step 3: Factory Reset / Wipe In recovery, navigate to Wipe or Factory Reset . Historically the most popular choice, OpenGApps faced delays
You must flash the LineageOS ROM and the GApps package before booting into the Android operating system for the first time. 2. The Worst-Case Scenario Fix
The you are encountering (e.g., Error 70, bootloop, missing Play Store)
Ensure your device has at least 50% battery to prevent sudden shutdowns during the flashing process.
MindTheGapps is the official recommendation from the LineageOS team. It is lightweight, stable, and aims to provide only the essential Google apps, closely matching the Google experience of a Pixel device. 12.1 (Android 12L) Recommendation: Best for stability. B. NikGApps (Highly Customizable)