How to combine Omnivore frontmatter with frontmatter in individual templates in Obsidian?

[groepl]

I'm using Obsidian templates with individual front matters. Example:

---
tags: type/note
# --- More about "How to use tags": https://forum.obsidian.md/t/how-to-use-tags/
aliases:
lead: +++ Lead paragraph goes here +++
visual: "![[image.jpg]]"
# --- Install plugin: https://github.com/blacksmithgu/obsidian-dataview
created: {{date}}, {{time}}
modified: {{date}}, {{time}}
# --- Install plugin: https://github.com/beaussan/update-time-on-edit-obsidian
template-type: Note
template-version: "1.10"
# --- Find latest updates: https://github.com/groepl/Obsidian-Templates
---

How can I merge these kinds of front matter settings with the Omnivore front matter? Merge not replace!

Thank you for help!