To be fair, R Shiny is incredible and really found a great stack that is robust. I have also been searching for such a stack in julia but not found it. I use Oxygen.jl for my APIs which works well. It’s not as mature as FastAPI but I get to stay in Julia. 
I saw a few cool html generators that could be combined with Oxygen and I think it was HTMX.jl but I might be mistaken. See the following discussion What can we learn from FastHTML? - #7 by tp2750
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