Can Mail fetch email signature set using Google Mail?
I ended up using Outlook Desktop as it allows me to copy/paste the GSuite signature. 
With the Apple Mail is a pain to resize the images and you just cannot float them. 

I opened a tread on Apple Community: https://discussions.apple.com/thread/250552009 and I hope to receive a reply. 

But I believe there is no easy way out. You cannot copy/paste or import signature from GSuite and you might need to edit everything. 

Very silly.