How do I make use of the "lang" option when using a two file approach?

I'm trying to add a "lang" attribute to the HTML produced by my shiny app that was added by this feature PR - https://github.com/rstudio/shiny/pull/3087

Added the lang argument to shinyApp() that specifies document-level language within the app for the accessibility of screen readers and search-engine parsers.

However my code is set up using the two file approach (of ui.R and server.R) and I have nowhere in my code that calls shinyApp() - where would I set this option or do I need to restructure my codebase?

Thanks!

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Update: in the end I simply had to add tags$html(lang="en"), to the fluidPage()

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