Extracting from .bib file with Raku (previously aka Perl 6)

I have this .bib file for reference management while writing my thesis in LaTeX:

@article{garg2017patch,
  title={Patch testing in patients with suspected cosmetic dermatitis: A retrospective study},
  author={Garg, Taru and Agarwal, Soumya and Chander, Ram and Singh, Aashim and Yadav, Pravesh},
  journal={Journal of Cosmetic Dermatology},
  year={2017},
  publisher={Wiley Online Library}
}

@article{hauso2008neuroendocrine,
  title={Neuroendocrine tumor epidemiology},
  author={Hauso, Oyvind and Gustafsson, Bjorn I and Kidd, Mark and Waldum, Helge L and Drozdov, Ignat and Chan, Anthony KC and Modlin, Irvin M},
  journal={Cancer},
  volume={113},
  number={10},
  pages={2655--2664},
  year={2008},
  publisher={Wiley Online Library}
}

@article{siperstein1997laparoscopic,
  title={Laparoscopic thermal ablation of hepatic neuroendocrine tumor metastases},
  author={Siperstein, Allan E and Rogers, Stanley J and Hansen, Paul D and Gitomirsky, Alexis},
  journal={Surgery},
  volume={122},
  number={6},
  pages={1147--1155},
  year={1997},
  publisher={Elsevier}
}

If anyone wants to know what bib file is, you can find it detailed here.

I'd like to parse this with Perl 6 to extract the key along with the title like this:

garg2017patch: Patch testing in patients with suspected cosmetic dermatitis: A retrospective study

hauso2008neuroendocrine: Neuroendocrine tumor epidemiology

siperstein1997laparoscopic: Laparoscopic thermal ablation of hepatic neuroendocrine tumor metastases

Can you please help me to do this, maybe in two ways:

1. Using basic Perl 6
2. Using a Perl 6 Grammar