Spatial SDK: persistent spatial anchors (create/save/load) – roadmap?

Hello,

I'm building a mixed reality app with Meta Spatial SDK 0.15.0 (Kotlin) 

In Unity, Unreal and native OpenXR, apps can create, save and load their own spatial anchors by UUID. In Spatial SDK 0.15.0 I could only find discovery of existing spaces (Scene.discoverSpaces, getAnchorPose). The Anchor class has a Storable component type, but there seems to be no API to create, save or erase an app-defined anchor. MRUK reads the system scene model but doesn't persist custom anchors either.

My questions:

1. Is support for creating, saving and loading custom spatial anchors planned for Spatial SDK? If so, is there an expected timeframe?
2. Until then, what is the recommended approach? Is it supported to call the OpenXR spatial entity extensions (XR_FB_spatial_entity, XR_META_spatial_entity_persistence) via JNI from inside a Spatial SDK app?
3. Will spatial anchors, MRUK scene data and MRUK QR code tracking be available on Meta VR Glasses?

Thank you for the answers.

Best regards,
Tamas