Intel web site says “no”. For that CPU, max 32GB. So if this is important to you, you would be waiting for v5 laptop, speculatively speaking. If this is really important to you, you would be contacting Purism officially and asking them. It is my guess that any later Intel CPU that Purism is likely to use would be at least 64GB max. How much did you want?
Discussed extensively here: Librem 5 & Pinephone Kill Switches but that’s your topic so you probably already knew that.
See also Comparing specs of upcoming Linux phones
Does anyone own both? Good question. Let’s see whether anyone chimes in.