How to GetStringMapStringSlice from environment variable?

[timurbabs]

Hi!
Have a probplem with getting map of string slices from environment variable.
I know how to get list of strings from environment variable:

SOME_EXAMPLE="TEST1 TEST2"

But how can I describe map of string slices as environment variable?
For example in .yml:

map:
  key1:
    - value1
    - value2
  key2:
    - value1
    - value2