you can use a workaround to achieve this, but it's not very graceful.
Let's image you have a text input filed (a control you can write into).
You can have step:
1) Type $(someText) into control
is a variable that stores an extracted value
2) Verify input 'SomeInput' value 'Exact' '$(textFromData).
is the name of a column from your data source.
Basically, first you type in the extracted value into a field. Then you use a Verification to verify the text against a value from your datasource.
the Telerik team