NCS LPN: Manual Friendship Request / Set Request Interval Runtime

We want to be able to manually send Friendship requests from LPN or to change request interval runtime.

It was possible to send requests manually using nRF5 Mesh SDK, however on NCS this function is missing.

The idea behind is to send Friendship requests with increasing interval in order to save battery power if Friend node is offline.

Is there any solution, or maybe it will be implemented in newer versions of NCS? At the moment we use v1.7.0.