Install SSLH on Home Assistant

I’d like to install SSLH on my raspberry pi running hassio. The reason being I need to access port 443 for more than one thing (home assistant, currently using a duckdns on port 8443), OpenVPN and SSH for ssh tunnelling.

I’ve got SSLH running fine on a little server PC running OMV, but I’d like to shift it over to the raspberry pi as it is far more reliable (I don’t restart it for months on end).

I can see a Docker image for it here and here but cant seem to install it using the Portainer add-on in home assistant. Can anyone help?