Get Additional Fields from Lookup for Workflow

Using SharePoint Online, I have 2 lists... System and Notice. 

System has the following fields:

1. Title
2. StandardReply

Notice has the following fields:

1. Title
2. Sender
3. System (Multi-select Lookup on System:Title)
4. Message

I have a workflow that runs when a new item is added to the Notice list. I'd like to have the workflow send an email that includes the selected Systems and the StandardReply field from the System List. The email would look similar to this:

[Notice:Title]

A new notice has been issued for the following systems:
-[System:Title] - [System:StandardReply]
-[System:Title] - [System:StandardReply]
-[System:Title] - [System:StandardReply]

[Notice:Message]

Best Regards,
[Notice:Sender]

My question is... How do I add the multiple selected values from the Systemlist to the email? And how do I access the additional field (System:StandardReply) from theSystem list so that I can add it to the email?

Thanks in advance,

cflbasser