How to access non locals variables (lazy format)?

Question

I am trying to do something like this (Python 3.8.x!):

import inspect

class LazyFStr(str):
    _template = ''
    def __init__(self, s):
        self._template = s
    def __repr__(self):
        vs = inspect.getclosurevars(lambda: True) #self.__repr__)
        print(vs)
        return self._template.format(**vs.nonlocals)

and when I call it in the REPL snippet like:

>>> x = 123
>>> s = LazyFStr('aaa {x} bbb')
>>> s

I get:

ClosureVars(nonlocals={}, globals={}, builtins={}, unbound=set())
...
KeyError: 'x'

which means that I cannot access the variable x. How to achieve this?