[5E] Manually temporarily modifying stats?

I'm using the D&D 5th Edition (OGL by Roll20) character sheet with D&D 5E compendium compatibility. There are some that, if dragged from the compedium, stats are temporarily changed while keeping the original stat if you hover over it. Items like Amulet of Health and Gauntlets of Ogre Power, as shown in the following image: I am wondering if there is a way to replicate this effect manually, as I find it very useful but could use it for other purposes.

This is handled through the MODS section of items. For more information on how to replicate it, add one of the items you mentioned above, and look at that item's MODS in the character's inventory. Then for your custom situation, you would need to add a new item to that character's inventory and set its MODS section to the desired modifier.