Ampersand synonym in YAML?

  name_synonyms:
      type: synonym
      synonyms:
        - "1,one"
        # - "&,and,+=>and"
        - '& => and'

How can I use YAML to correctly configure a synonym for ampersands and the
'plus' symbol and the word 'and'?

The above synonym for 1/one seems to work.

Thanks
Lee

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