Hi. I don’t know if this is an option, but if you can find a download of that font you can install it in your app yourself. I’ve used this method before and it works well.
So you should be able to install it to your app (assuming the licence allows). There are various guides to doing so including this one: How to Setup a Custom Font | Bubble
If we want to have a font with multiple weights, each weight will need to be added as a separate CSS file, with a unique font family name.
The CSS bit seems a bit complex with 9 different weights.
In terms of the bug report, that particular font doesn’t work anymore but is still an option in the dropdown, so at the least it’s a bug till it is removed from that list.
Having the same issue — the right answer here is for Bubble to swap “Source Sans Pro” for “Source Sans 3” (which is available).
Source Sans 3 is actually available further down in the dropdown, however the kerning/width or available weights are different somehow, leading to some wrapping in fixed-size textboxes my design at least. I’m using “Inter Tight” as the alternative in the interim.