Defining a colour by referencing a colour and adding transparency information?

This is just a minor question to speed things up a little bit, but I'm wondering if I can reference other colours and add additional information in my XML file.

I know that this code works:

<color name="primary1">#708FA3</color>
<color name="primary1_transparent">@color/primary1</color>

But I'm wondering is there a way to add a level of transparency to primary1_transparent? Either by concatenation in the assignment or afterwards.

Obviously the time saving on this isn't significant so an awkward workaround isn't going to help much but it seems like a possibly existing feature/hack I can't find.