I remember answering the same question before. The answer is "No" by value passing, but you could do it using set_param().
For MyValue=1, the value (1) of the variable name "MyValue" is passed into the mask workspace. Inside the masked subsystem where "MyValue" is used, it is using the value (1), not the name "MyValue".
But for "To Workspace" block, the variable name "name" itself is used, not the value of the variable name "name".
This sounds confusing but it is the case for a few similar parameters for other blocks.
If you are open to write some lines of code in the call-back of the mask, you could use set_param() to set the variable name of the To Workspace block, based on the name provided at the mask dialog.
What I would suggest is to use other signal logging methods, not to use "To Workspace" block. Basically, select the signal line, right click, select "Log Selected Signals".
