Redirect tee output to the variable instead of file

I'm trying to do the loop where output of each curl command which is returning json data is allocated to the variable/array. I'm using tee command to get my wanted value plus next token for next json piece of data. When I save data to file everything works fine but instead of saving data to file I would like to keep it in array/variable.

This works:

while  [[ "$next_token" != "null" ]]docurl -u "$user:$password" "https://mylink.dot" \    | tee >(jq -r '.dataSummaries[] | .dataId'>> my_data_file.txt ) \>(jq -r '.nextToken'>next_token_file.txt) > /dev/nullnext_token=$(cat next_token_file.txt)done

I tried this:

while  [[ "$next_token" != "null" ]]doindex=$((index+1))curl -u "$user:$password" "https://mylink.dot" | tee >(jq -r '.dataSummaries[] | .dataId' | read my_array[index] ) >(jq -r '.nextToken'>next_token_file.txt) > /dev/nullnext_token=$(cat next_token_file.txt)done

When I use |read var my variable is empty.

How in this case can I store json data (and next token) in variable, not file.