Text Chain is a script for After Effects from Braindot Design. It links different text layers dynamically and constrains the full string within a given width.
The catalog lists Text Chain at version 2.1, released on November 23, 2020. That update fixed an issue with international versions of After Effects. The 2.0 release before it made the tool compatible with macOS Catalina, resolved a licensing issue, and fixed a missing pseudo reference error that produced a 'missing effect reference' message. As of these updates, Text Chain supports After Effects 2020 and CC 2019. The initial release dates to July 2019.
Text Chain is listed here as free. For current licensing terms, downloads, and any newer builds, refer to the developer's page on aescripts.