Feature request - nesting arrows according to call nesting

[marekdef]

Thanks for the neat project, I managed to run this plugin in a project (kotlin + java) without major issues. If a function1 calls function2 we would see sth like -> function1 -> function2 <- function2 <- function1

would it be possible to add level of nesting so is easier to figure out call hierarchy? sth like -> function1 --> function2 <- function2 (not sure really if it should have two hyphens or one and a space) <- function1

or similar with spaces indicating nesting level?