From my tests, it looks like the other lookup fields are returned, but are not added to dynamic content. So we can access them, but we have to use an expression to do so.
In my test, I have one of these columns called Lookup:Modified, that displays the modified date of the list item the lookup points to. When I run Get Items and inspect the data, I see that it is arranged like this:
"body":{
"value":[
{
"Lookup_x003a_Modified": {
"@odata.type":"#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id":10,
"Value":"2020-10-09T18:06:44Z"
}
}
]
}
(I cut out a lot of irrelevant stuff.)
This means that if we loop over the items from our Get Items action (using 'value' from the dynamic content), we can access that field value with this expression:
item()?['Lookup_x003a_Modified']?['value']
Note that my column name is Lookup:Modified, but the colon is converted to '_x003a_' when I use it in an expression.
Hopefully that helps.
