Is your proposal related to a problem?

Currently we have to add datasource from left sidebar. There is no option to add datasource from the query panel on the go.

Describe the solution you'd like

Add a button " add datasource " to the right of listed data sources , default sources will be runjs and REST api so we can place button at last.

This button when clicked can open the same modal for adding datasources used in left sidebar.

Describe alternatives you've considered

Nothing.

If the feature is approved, would you be willing to submit a PR?

NO.