How to run sudo lnav and with user defined formats?

Question

I have installed lnav as snap package according to these instructions: http://lnav.org/downloads/

sudo snap install lnav

I have made couple of proprietary log file formats for inhouse developed program logs. I installed these using commands like:

lnav -i bbckpLog.json
info: installed: /home/jk/snap/lnav/116/.lnav/formats/installed/bbckpLog.json

and checked that they are correct by using

lnav -C

They work fine when I e.g. run (proprietary logs are in /home/jk/tmp):

lnav /home/jk/tmp /var/log 

I can browse combined log view with system logs and proprietary logs.

Problem is that when I try to browse those logs only the root user can read (permission 600), sudo lnav cannot find my proprietary formats.

sudo lnav /home/jk/tmp /var/log/pm-suspend.log

I also tried to give the configuration directory from command line like this:

sudo lnav -I /home/jk/snap/lnav/116/.lnav /home/jk/tmp /var/log 

but it still does not find/use my proprietary formats.

OS is Ubuntu 16.04

How to fix this?