Using font (Merriweather) alternative style in Webflow

Does anyone know how to get Merriweather alternative style to work in Webflow?

I’ve uploaded it as custom font as .ttf.

Have tried the following but it didn’t seem to work:

h1 { font-feature-settings: "salt" on; -moz-font-feature-settings: "salt"; -webkit-font-feature-settings: "salt"; }

and similarly:

.class { font-feature-settings: "salt" on; -moz-font-feature-settings: "salt"; -webkit-font-feature-settings: "salt"; }

Would appreciate any help on this!