I have two lists x and y:

```
x <- list(id1 = list(a = list(t = 5)), id2 = list(a = list(t = 1), b = list(t = 3)), id3 = list(a = list(t = 1), b = list(t = 2)))

y <- list(b = list(k = 7))

```

I need to modify x list and add corresponding "b" elements from y list to obtain z list:

```
z <- list(id1 = list(a = list(t = 5)), id2 = list(a = list(t = 1), b = list(t = 3, k = 7)),
  id3 = list(a = list(t = 1), b = list(t = 2, k = 7)))

```

I try to use `list_modify(x, y)` and `list_merge(x, !!!y)` from `purrr` package but obtain wrong result.
How to do this in R?