Internally you could use https, like @anon43302295 states, and your browser will be able to make an execption for the certificate so you can access HA.
If however you also use the mobile app, my recent experience is that you HAVE to setup a reverse proxy, like @anon43302295 says.
Have a look at this Remote access for Home Assistant
Your problem is now local access but that topic describes the whole situation.
EDIT: https with local hostname/IP that is