@template is not in JSDoc's documentation (the tool that generates documentation from comments), but it's in TypeScript's JSDoc (that's not there for documentation as much as for static typing), as linked to by Rich Harris in the tweet you cited: typescriptlang.org/docs/handbook/j...
In other words, I wouldn't use "what's supported by one specific tool that generates documentation from comments" as an argument for "it's non standard" when your use case is not generating documentation with that specific tool.
@templateis not in JSDoc's documentation (the tool that generates documentation from comments), but it's in TypeScript's JSDoc (that's not there for documentation as much as for static typing), as linked to by Rich Harris in the tweet you cited: typescriptlang.org/docs/handbook/j...In other words, I wouldn't use "what's supported by one specific tool that generates documentation from comments" as an argument for "it's non standard" when your use case is not generating documentation with that specific tool.
I'll keep that in mind, thanks :)