Wrapping relative to current indent?

I'd like to be able to "set wrap linebreak" so that my long(er)
lines of code wrap at my 80-column margin. However the wrapped
lines display starting at the left margin. E.g.

|def my_func() |
| for thing in (1, 2,|3, 4, 5)
| |
^ wrap column

Setting 'wrap linebreak' wraps to look like

|def my_func() |
| for thing in (1, 2,|
|3, 4, 5) |

whereas I'm hoping for something like either wrapping to the
*same* indent as the wrapped line,

|def my_func() |
| for thing in (1, 2,|
| 3, 4, 5) |

or even better wrapping to the same-plus-a-multiple-of-'shiftwidth':

|def my_func() |
| for thing in (1, 2,|
| 3, 4, 5) |

Any leads on coercing Vim to do such indented soft-wrapping
(without inserting the literal newlines/indentation into the file)?

-tim

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