How to add custom license that cannot be generated?

[alizainc]

AckGen is unable to generate the License details for https://github.com/cozality/Thrift-Swift package. I guess the reason is because it does not have a LICENSE file in it, but rather the license is in readme and in comments of Package.swift. How can I manually add the license details for this package if AckGen cannot pull it from the SPM resolve file.