I would like some more advanced printing and reporting capabilities.
I am using Carbone.io to handle PDF generation, but it requires extra setup to get working with Retool. Carbone itself is open source so maybe you guys host your own Carbone server? You could make a component which would make integrating with it quite easy. There may be other options out there.
For those who do not know it, it also does many other file formats like Word, Excel and more.
With this it would be pretty easy to make invoices, statements, reports and such.
Also, being able to print any output directly from the browser without needing to download first would be a bonus.