I work in Gleam on my software and it's a treat. I use the FFI for JS libraries all the time.
Being able to talk passionately and with experience about "exotic" languages during an interview will help you land the job.
I will hire the one that talks about the joy of FP and/or static typing ANYDAY over the programmer with only JS experience an no visible interest to look beyond.
Let’s be honest , your realistic options for work are Java, C#, C++, and depending on the industry, Swift, Go, Kotlin, Dart and Rust.