&asm_mbr_name is only valid in the context of a repeat region table. It won't work in the title block as you'd like.
However, with the part in question you can use the built in parameter &model_name. It will pull the name of the active part or assembly. If that is in the format in the titleblock it will work as well, as long as the model you want is active before adding the sheet where the views will be.