Using custom Essential Graphics template for subtitles?

@Kaiden S   I built a new plugin for this called Captioneer. You can now use your After Effects .mogrts for Premiere Pro subtitles!

Subtitles /captions are a different beast from regular titles. Typically "Source Text" will create a text field to fill in, but since your subtitles are (presumably) already generated this won't work. Are you just hoping to stylize all your subtitles to be the same? You can use the built-in tools to stylize a caption and then push that style to the whole caption track.

If you want custom animations pulled from an After Effects template, you'll have to first select all your captions and go to Graphics and Titles > Upgrade Caption to Graphic. Unfortuantely I don't know of a way to drag a MOGRT template over existing text without having it reset. So you may be forced to drag your MOGRT on TOP of each caption, copy the text from the caption and paste it into the Source text field to populate the MOGRT, then delete/hide the caption. I'll have to think on whether there's a better way to do this.