Yes,you could use custom fonts in Raptivity 2020.Just follow below steps:
1.Open any interactions
2.On the left hand side column,there is a “Font”
3.Click on it
4.To add new font click on “Add new” button.(In case you already have fonts library,then you could search required font by using search or scroll bar)
5.Import your custom fonts(.OTF,.TTF and .WOFF format) to the application
6.After upload,select the font to use it.