PowerDoc only supports placeholders in slide paragraphs, notes and comments.
In the PowerDoc Document Flow add a variable of type “object” and set as value as json object. The values can be hard coded or retrieved in one or more (Dataverse) actions before. The properties in the json object should refer to the placeholder names and values should be of type string. See tips & trics for usage value expressions.
Example:
{
"companyname": "Contoso",
"presentor": "John Doe",
"date": "May 5, 2024"
}