Insert text below username?

[Alteras (Steven Chang)]

Would this work for you?

.topic-meta-data .names {
  flex-wrap: wrap;
}

.names::after {
  display: block;
  content: "hello world";
  font-size: 14px;
  width: 100%;
  flex: 1 0 100%;
  order: 4;
}

edit: added order property for mobile