Hi,
in the TurrisOS 5.x package feed you’ll find the adblock package (plus LuCI companion/configuration package) with native kresd support.
current stable version in OpenWrt 19.07.x aka TurrisOS 5.x: adblock 4.0.5-3 plus luci companion package
The latest adblock releases are only compatible with TurrisOS 5.x!
Link to the latest adblock documentation
Main support thread in OpenWrt forum with more detailed installation instructions, version history etc.
Have fun!
Dirk