That is what the URL encoding action is for.
The naming doesn’t really matter. That variable represents the URL-encoded path to your desired folder.
Switch the text saying “Vault Name” to your vault name and the text saying “Folder name” to your desired filepath.
Don’t forget: you have to take these actions and put them in your own shortcut to retrieve the podcast data you want. Last, you need to use an “Open URL” action to actually launch the URL scheme at the end!