OWA launch Draft in edit mode

Using the MS Graph API I get get a weblink back to an email that I have created in the Drafts folder

The link looks along the lines of

h ttps://outlook.office365.com/mail/deeplink/read/ZZZZZ?ItemID=AAAA&exvsurl=1

Sometimes I have seen viewModel=readMessageItem on the end

What I want to do is have it launch in the browser in Edit mode and not have to click the pencil button

I can not seem to find any documentation for viewModel but is there a URL parameter that would help me achieve this?

Thanks