Is it possible to change dashboard layout with Cloud REST API?

I can create a dashboard and add gadgets to it using the Cloud REST API, but there doesn’t seem to be an API for updating the dashboard’s layout.

The default layout of a dashboard seems to be 2-column and Cloud REST API disallows adding a gadget at position (row: 0, column: 2).

How can I change the layout of a dashboard?

There is this set property API:
https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-dashboards/#api-rest-api-3-dashboard-dashboardid-items-itemid-properties-propertykey-put

But it is unclear what item ID and property key should be, the example provides no list of possible values.

Were you able to solve it?

Nope, it seems it is not supported.

I was migrating filters and dashboards from server to cloud (which is not fully supported by the migration assistant plugin). Fortunately only a few dashboards are in the 3-column configuration, so those are fixed manually after migration.