At present, only websafe fonts can be used by Tableau Reports/ Dashboards.
If there is a need to use custom fonts then Tableau needs browser to have it pre-installed else the report is rendered in default available font (e.g. Arial).
This is cumbersome as it impacts the UX as well as demands additional installation at the client side.
There should be provision to add custom Fonts in tableau server which can be used to render the report/ dashboard thus avoiding Font installation at the client side.