No, the API we use for data counting has no ability to do that, sorry. Also, roaming is slowly going away in most countries in the world due to government changes.
For example in the EU charging for roaming was banned in 2017.
In the USA roaming is also rare these days if it even exists at all anymore with the major mobile providers. I travel to remote locations with limited service in the US fairly often and I have never seen roaming on either of my phones that use different major mobile providers.
Perhaps MVNO services Mobile virtual network operator - Wikipedia still have roaming, but I searched the web out of curiosity I couldn’t find anyone talking about roaming in any recent posts in forums, etc… in the USA. Perhaps I did not look closely enough though…
May I ask what countries you will be traveling to? “Roaming” may not even exist there anymore.
People I know who travel sometimes just get to their country, then buy a new sim when they get there and use that until they leave. The new sim provides better service usually and since they are usually pre-paid you shouldn’t have any problems with unexpected overages.
If it was me I’d just buy a new sim card when I get there and swap them out until I leave. If you need to make some phone calls with home numbers for business, etc… maybe just temporarily use a separate VOIP service Voice over IP - Wikipedia, then cancel it when you get home.
You can still use our Android app to keep track of your data usage on the sim to stay under your pre-paid limits, but you don’t have to worry about weird and complicated “roaming” issues with your mobile provider you use at home.