Adding headers to external href

I want to use an external href for configuration. I will need to use some kind of authentication. I don’t want to pass the authentication token as a query param.
Is there a way to add headers when using external href?

Why not just do it via API commands via user input.

Httpget can send headers no problem.

I wish i could. I need to enable configuration of these settings also from my web app and since there is no way to set the settings values through the smartapp hence they cannot reflect the value set in the web app, I am forced to use the href.