If any PHPStorm users want better syntax coloring for Antlers I figured out a better way.
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Install Handlebars/Mustache plugin and enable the checkbox for “Open HTML files as Handlebars/Mustache” under Languages & Frameworks > JavaScript > Templates. Not perfect but much, much better!
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This makes it even better. Disable Inspection and Syntax for Handlebars by click on Hector icon and changing the Highlighting Level for Handlebars to "None". Now no inspection errors!
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Enjoy Statamic Antlers inside .html files in PHPStorm.