In Jira Cloud, I have a custom field that is date type (no time) and I have two transitions in a workflow which we do *not* want to display to the user if they are not allowed based on a condition. A validator would not be appropriate in this situation, because it does not hide transitions. What are the available dynamic options available for Value Field condition in workflows?
For example, we'd like to set a condition on each transition:
My Date (custom field) = Today's Date
and
My Date (custom field) > Today's Date
I've seen values being used under the "Value" field below such as "%%CURRENT_DATE%%" or "{{now.JiraDate}}" or "{{now}}", none which have worked. I can't seem to find any reference to these anywhere in Atlassian's documentation.

Can anyone point me in the right direction on this?
Regards,
James