Some expressions for workflow definitions in Power Automate and Azure Logic Apps obtain their values from runtime actions that might not be present when your process starts to run. You can use the Workflow Definition Language's expression functions to refer to or handle the values in these expressions:
Open Power Automate Reference in Microsoft Learn
Formulas combine many elements:
Open Power Apps in Microsoft Learn
Categorized PowerApps Functions List here:
Open in Matthew Devaney’s Blog