I have started a<appian-record-view> that starts a related action via process model but it doesn't allow me to have a secondary input or parameters
<appian-record-view>
docs.appian.com/.../Embedded_Interfaces.html
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Case1,
if the record contain the respective parameters then it can be passed in the record while adding related action itself but not when related actions are called in UIs as its only supporting Identifiers
case 2
a. Create a dummy record as expression backed record with dummy data as {Id:1 and data:null} and add your process model in it as a related action .
b. This will require to query your recordId in the process rather than sending it from interface while calling related actions and perform all your requirement in the process model.
c. In this way you can have the pop up UI functionality through any UI