Add floating point value to android resources/values

I’m trying to add a little space between lines to my TextViews using android:lineSpacingMultiplier
from the documentation:

Extra spacing between lines of text,
as a multiplier.

Must be a floating point value, such
as “1.2”.

As I’m using this in a few different TextViews I would like to add a global dimension/value to my resources, but I don’t know which tag to use, if it even exists.
I have tried all resource types that make sense to me, but none of them works.

What I would like to have would be something like this:

<resources>
    <dimen name="text_line_spacing">1.4</dimen>
</resources>

Edit: I’m aware of android:lineSpacingExtra (which needs a dimension with an appended unit), but I’d like to use android:lineSpacingMultiplier if possible.