Dashcam via 12v rearview mirror USB power?

[balefire]

I used to use a Waylens Secure 360 dashcam which received a 12v input via my rearvier mirror tap with a type C USB.
Unfortunately this does not work with my Garmin 66W dash cam which apparently is a 5v input dashcam.

Blackvue and Thinkware apparently are 12v input dash cams but they do not use a USB input but another input?
Are there any dash cams that receive a 12v input via USB so I can use my existing rearview mirror type C USB power tap?
Or is there a way to power a Blackvue or Thinkware via my USB power tap?
Thanks!

 

[balefire]

alternatively, is there a small pass thru battery (e.g. voltaic) that accepts a 12v Type C USB input and has a 5V USB output?
this would allow me to do a rearview mirror 12v to pass thru battery to 5V dash cam.
the voltaic V88 appears to do this, but is huge.
the voltaic V25/V50 are all 5v USB input only.