It is possible to do using Arcade expressions. See example here of a 1:M join between parcels and addresses: Residential Permit Parking

I'm not sure this is the most efficient way to accomplish this, but it works:

1. Get the related table using FeatureSetById
2. Use the filter function to narrow the results to the rows you are interested in.
3. Use a for loop to interate through the feature set. This is where you can format the data to print however you would like.

//Get related table
var ineligibleAddresses = FeatureSetById($datastore, '32')

//Get related features from table
var relatedAddresses = Filter(ineligibleAddresses, 'Parcel = '+$feature.Parcel_Nbr)

//String to print
var parcelIneligible = ''

//Iterate through each row and format
for(var address in relatedAddresses) {
    parcelIneligible = parcelIneligible + address.HouseNbr + ' '
    + address.StreetDir + ' ' 
    + address.StreetName + ' '
    + address.StreetType + ' '
    + address.Note + ' '
    + TextFormatting.NewLine
}

//print related addresses
parcelIneligible

It is possible to do using Arcade expressions. See example here of a 1:M join between parcels and addresses: Residential Permit Parking

I'm not sure this is the most efficient way to accomplish this, but it works:

1. Get the related table using FeatureSetById
2. Use the filter function to narrow the results to the rows you are interested in.
3. Use a for loop to interate through the feature set. This is where you can format the data to print however you would like.

//Get related table
var ineligibleAddresses = FeatureSetById($datastore, '32')

//Get related features from table
var relatedAddresses = Filter(ineligibleAddresses, 'Parcel = '+$feature.Parcel_Nbr)

//String to print
var parcelIneligible = ''

//Iterate through each row and format
for(var address in relatedAddresses) {
    parcelIneligible = parcelIneligible + address.HouseNbr + ' '
    + address.StreetDir + ' ' 
    + address.StreetName + ' '
    + address.StreetType + ' '
    + address.Note + ' '
    + TextFormatting.NewLine
}

//print related addresses
parcelIneligible