This is actually an issue I was aware of. Unfortunately textview on iOS does not have any native support for tables like the MacOS counterpart does. For tables in Arctic, I rolled my own using tab breaks for the layout, and some custom drawing for the background. This solution does not allow word wrapping within columns in the table, nor does text alignment work correctly when using tabs.
In the end, what I’ll end up doing for this, is embedding a custom view within the text view for rendering tables. This will come later as I plan to include this in a larger text rendering update that will allow for in-line media rendering, link previews and improved code and block quotes etc.
This would be a relatively trivial task using SwiftUI, but in UIKit, it’s going to take me some time to develop a custom solution.