Is there any way to use similiar method but with API v2 (Client class)?
I used this method https://docs.tweepy.org/en/stable/api.html#tweepy.API.lookup_friendships
API.lookup_friendships()
But now I need to migrate to API v2
There is no equivalent endpoint in Twitter API v2 yet.
You can refer to the Twitter API endpoint map in the Twitter API documentation.
It says "[COMING SOON]" for GET friendships/lookup, the Twitter API endpoint API.lookup_friendships
uses,.