It isn't possible to copy Performance Counters between LA workspace, however you can automate the process using PowerShell. Here is a SO thread where one of the community member has provided sample solution on how to add the performance counter using PowerShell.
Another article for your reference: Create workspace and configure data sources.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…