No plug-ins required. Motion included.

Just type in your text, and the box will automatically adjust to fit!

You can also freely customize the font, color, and background On/Off.

8 seconds.

Available in After Effects 2025 (ver. 25) and later.

This is the Japanese version.

English version is here

https://www.motionelements.com/after-effects-template-55179506-gradient-box-title-english