Most registrars do not provide the ability to manage DNS resolutions in bulk.
But you can set up your own DNS server.
Here is the demo, how to batch add TXT records:
1. Add TXT record template:
2. Batch add domains to set txt records:
The entire operation can be completed in less than a minute.
This is a DNS specially designed for domainers, using this DNS will save you a lot of time.