Ability to append layout elements to dashboards via the API

What is the problem or goal the end user is trying to solve or accomplish?

Users would like to easily be able to add new layout elements (such as a Text block) to existing dashboards via the API.

How are they solving it currently?

Currently, it requires 3 steps:

1. Retrieve the current dashboard content.

2. Appending the text block syntax in a compatible way.

3. Use the Update a Dashboard API endpoint.

What is the recommended solution by the Customer?

Create an endpoint to append layout elements to an existing dashboard.

This is currently possible for charts (by adding the dashboard ID to the dashboards key on the payload), but it's not possible for layout elements.