jq -r '
  to_entries[] |                  # replace items with {"key": ..., "value": ...}
    .key as $username |           # store top-level key in $username
    .value |                      # later code operates only on value
    to_entries[] |                # break top-level value into key/value pairs
    ([$username, .key, .value] |  # create list w/ desired output fields
     map(tojson) |                # encode those fields as literal JSON
     join(" "))                   # ...and separate those JSON fields with spaces
'

连接到一行，如下所示：

jq -r 'to_entries[] | .key as $username | .value | to_entries[] | ([$username, .key, .value] | map(tojson) | join(" "))'

@peak还友好地指出了一个更简洁的替代方案，它避免了$username：

jq -r '
  to_entries[] |      # Replace items with {"key":..., "value": ...}
    [.key]+(          # Prepend key to results of next group:
      .value |        #   ...creating that group by starting with the value
      to_entries[] |  #   ...then splitting it further into key/value pairs
      [.key, .value]  #   ...then putting key and value into a list
    ) |
    map(tojson) |     # encode the results of the above as JSON strings
    join(" ")         # ...and then separate those strings with spaces.
'