How to use mustache file in Idea Community?

Question

IntelliJ IDEA

I saw how in a video lesson on spring a person decided to abandon the timelif and instead decided to use mustache, and refactored the html file by changing the extension to .mustache, only when I did this, it didn’t work, they say it’s some kind of file with an unknown extension, on the site Idea says that mustache is only supported in ultimate , is there any way around this ?