rpi: show text overlay in secondary stream

[MacGH23]

Which version are you using?

1.12.2

Which operating system are you using?

Linux arm7 standard

Describe how to replicate the issue

I use a raspberry to stream the camera picture to motioneye.
If I use a secondary stream with a low resolution the text overlay only show up on the
primary stream, but not on the secondary stream.
Wish: Also it would be great to change the position (up/down/left/right) of the overlay

Config:
paths:

primary stream

rpihigh:
source: rpiCamera
rpiCameraWidth: 1600
rpiCameraHeight: 1200
rpiCameraFPS: 15
rpiCameraCodec: auto
rpiCameraBitrate: 1500000
rpiCameraTextOverlayEnable: true
rpiCameraTextOverlay: '%Y-%m-%d %H:%M:%S - MediaMTX'

secondary stream

rpilow:
source: rpiCamera
rpiCameraSecondary: true
rpiCameraWidth: 768
rpiCameraHeight: 576
rpiCameraFPS: 15
rpiCameraCodec: auto
rpiCameraJPEGQuality: 60
rpiCameraTextOverlayEnable: true
rpiCameraTextOverlay: '%Y-%m-%d %H:%M:%S - MediaMTX'

Server logs

No response

Network dump

No response