Indeed, this is possible via adblink. Moreover, this method was already mentioned here:
Here's a quick rundown of how to access the hidden menus in com.droidlogic.tv (the app that is the the "More" menu on the Stream 4k). You'll need to enable Android's Developer Mode to do this. They seem to do stuff, but your results may vary. Might fix issues others are having with random wake...
www.tivocommunity.com
You can use this command to call this menu:
Dolby Vision menu (ON/OFF; Dolby vision sink-led; Dolby vision source-led)
am start -n com.droidlogic.tv.settings/com.droidlogic.tv.settings.display.dolbyvision.DolbyVisionSettingActivity
Here you may choose now:
Dolby vision source-led
Now Dolby Vision and HDR works correctly in AutoHDR mode.
But this setting is reset when you poweroff/restart it.
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And there is an option on how to launch this menu without adb/adblink
Install Activity Launcher from here
https://apkpure.com/activity-launcher/de.szalkowski.activitylauncher/versions (if you choose to download -> Old Versions there is a regular APK installer)
Then launch it, select
Droid Settings ->
.display.dolbyvision.DolbyVisionSettingActivity
The desired menu appears and select
Dolby vision source-led
(One time my Tivo hung when switching, but I observed it only once)