Add GPS coordinates to frontmatter

[voigt]

First of all great plugin, thank you for the great work!

I'd wish for a feature, where GPS coordinates could be added to front matter - ideally in a templated form.

Example templates that I need for some use cases:

---
latitude: {lat}
longitude: {lon}
---

---
coordinates:
  - {lat}
  - {lon}
---

Additionally, it would be great if there would be an option to overwrite existing frontmatter (or prevent plugin from overwriting).

Thank you for consideration!