docs: add declarative syntax examples for helm

[morey-tech]

Closes #10763

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• Optional. My organization is added to USERS.md.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).

[codecov]

Codecov Report

Base: 45.65% // Head: 45.65% // No change to project coverage 👍

Coverage data is based on head (791b53f) compared to base (11c44f2).
Patch has no changes to coverable lines.

❗ Current head 791b53f differs from pull request most recent head ec13cee. Consider uploading reports for the commit ec13cee to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10764   +/-   ##
=======================================
  Coverage   45.65%   45.65%           
=======================================
  Files         236      236           
  Lines       28702    28702           
=======================================
  Hits        13104    13104           
  Misses      13804    13804           
  Partials     1794     1794           

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[crenshaw-dev]

Good addition. Thanks @morey-tech!