Adding Remote Asset Picker to Page Editor Siderail in AEM 6.5

I have integrated Remote Assets (Next Gen Dynamic Media) in my AEM 6.5 project, and it's working fine with the Core Components Image v3 image picker — I can browse and select remote assets directly in the component dialog.

Now I want to surface the Remote Asset picker in the Page Editor siderail (the Assets tab on the left rail), so authors can drag remote assets onto the page the same way they drag local DAM assets.

How can I enable/configure the remote asset picker in the Editor siderail?

Current State

• Remote DM (Next Gen) integration is configured via the Cloud Service / IMS setup and asset selector.
• Image v3 component dialog already shows the remote asset picker correctly.
• The default siderail Assets tab still only shows local DAM assets, not the remote repository.

Details I'm looking for

1. Is the siderail Assets tab even capable of pointing to the remote asset repository?
2. If it's possible, How can I configure it?

Any guidance, sample configuration, or confirmation of supported vs. unsupported behavior in AEM 6.5 would be appreciated. Thanks in advance!