Hi Nataliya! I don't know if this will help or not, but this is how we did this in 8.2 on prem with some Java Script. We renamed our Cases to Incidents. We have a web resource with the java script screen shot below. In a nutshell, the java script would dump the deep link into a hidden field on the form and then we email out the data in that hidden field. The dev who came up with this also had this to say.
"That Xrm.Page.data.entity command is the bomb. There's an API somewhere that explains all of the parameters. It's super useful."
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