Send "Here I am now" location report in a Messages.app thread on a Mac
Yes location can be seen on Mac, but needs to be enabled on iOS. 


  Friends can share their location through the Messages or Find My Friends app on an iOS device. You can see the location they shared on a map in Messages.


https://support.apple.com/en-in/guide/messages/icht18df1a6a/12.0/mac/10.14
 landed here from macOS help menu. 

Otherwise, pin drop can be done in Maps app and that can shared using messages. To do this: 

Go to Maps on the Mac, click on the Show your current location arrow, click on the Share icon and then select Messages. A popup then appears for you to select your recipient(s) and they're sent a message starting with My location followed by a URL followed by a static image of your location. The recipient can look at the image of your location, or they can tap on the link and that'll open Maps on their device with your location and directions to get there.