Can we add multiline customization?

**Is your feature request related to a problem? Please describe.**
Now if users create multiple lines of text, all of them fall under the same style.

**Describe the solution you'd like**
Users could have freedom to customize each line so that each line has its own style.

**Describe alternatives you've considered**

**Additional context**

The issue does not name files, tests, or an entry point. First inspect how multiline text and styles are represented in the repository, then determine the per-line customization behavior and verify that the generated SVG applies each line's style independently.

Written by the indexing model from the issue text.