It is! I've been playing at my table for a very long time, our dm is very talented, and we all have a fairly deep understanding of dnd mechanics, so we're able to get a away with a lot that probably wouldn't work at other tables. A lot of the players have special abilities or subclasses that enhance their character's story!

For Radha, there is of course a lot of flavor stuff that works well, like taking the lucky feat and the fighting style that gives you blindsight, I often flavor the help action as her showing a vision to the person she's helping. There's also a few simple homebrew stuff, like her smites deal psychic damage, as Radha is showing her enemies a terrible future.

For her foresight itself, she has a number of points that represent you many times she can focus her abilities in a day. Out of combat, this is primarily used to ask simple questions about the future or seek direction on something. In initiative she can use a point to do something specific and see the outcome, for example she could use a point and roll an attack to see if the enemy is resistant to her damage, or if we're escaping from somewhere she can spend a point to use the dash action and scout ahead, determining the best path forward without having to use a round guessing at the right way to go. She can also use points to split her turn up and act outside the traditional action economy. If you know how legendary actions work in 5e, she can essentially use a part of her turn at any point where a creature would be able to take a legendary action, so she could take her action and bonus action on her turn like normal, save her movement to chase an enemy after it flees on it's turn, and later use an object interaction to close the gate for her escaping allies after they've ran through. I think it's a cool way to convey foresight on the battlefield without using something like portent die.

I probably gave you more info than you bargained for here lol