If you prefer to stay within the TLauncher interface, you can manually add Lunar Client's "Offline" versions:
However, community-made workarounds exist that allow you to use Lunar Client’s performance boosts and mods on a cracked account. Below is a guide on how this process typically works using third-party patches. How To Use Lunar Client On Tlauncher | Cracked ...
To use Lunar Client without an official account, most players use a modified version often referred to as or a similar crack. If you prefer to stay within the TLauncher