@CATboardBETA Seems like Jetbrauns uses JS/TS support to differentiate their Community and Ultimate editions so you're not going to find such a plugin (the only supported “plugin” is the upgrade to Intellij Ultimate).
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If you don't want to do that, consider running a separate editor for JS/TS tasks. VS Code is a popular choice in this space. This won't address your Language Injections requirement though, aside from trivial cases like “JSX in JS”
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