Featured question: None.
Q1: Do you have advice regarding how to pray for people requesting prayer for others in a group chat? (Like a prayer chain, where the person is asking for prayer for someone they're not with or not close to/in contact with)?
A: Jesus paid for all sickness and all sins. So, it does not matter what it is. In principle, it is advised to get as physically close to people as we can while ministering healing.
Jesus did most of His healings by laying hands; only two examples of remote healing as seen in the New Testament. The other reason is to develop relation, which lays the foundation for discipleship.