Add Expertise to Saving Throws

Hello, I am using the 5e OGL sheet and was having trouble incorporating a certain mechanic. We have a campaign with a mechanic of adding expertise in saving throws (double proficiency). However, I messed with several of the attributes and didn't find a working solution. Is there a proper solution for this? Thank you

You can add Expertise in the settings (Cog Wheel)   Ignore this, misread question.

That covers skills but I don't think there is a way to do it for saving throws as standard, you could likely create a faux-item with a mod that increases specific saves... again, not sure you could make it dynamic by proficiency increase but it doesn't happen often enough to be a chore... will take a look now. [edit] Turns out there is a way to increase them as standard! You can't use an attribute reference like @{pb} as it turns out but you can add your current proficiency and just update it each time you get a prof increase.

That'll teach me to reply before my morning coffee! 

Yeah, I wound up just changing the modifier to a fixed +2. I tried changing a bunch of attributes like the charisma_save_prof and the rolls, but they would all just wind up being reverted. Thank you all