Adding message to TeamCity's build status while keeping previous values

I'm trying to add a message to TeamCity's build status from a script, while also keeping previous addings from other scripts.

I know about

##teamcity[buildStatus...

, but with that I can only take what TeamCity itself computed via

{build.status.text}

and append/prepend text. I cannot append/prepend to whatever was there before.

Example:

Something

> magic append >

Something, Foo: 10

> magic append >

Something, Foo: 10, Bar: 11

So far I can only think of generating

teamcity-info.xml

which is little bit overkill for scripts given you have to parse it (if already exists), modify and then store again. Maybe there's easier way.