Can linked ip be automatically update in router, if ddns is not available, by only nextdns dns only

Actually I have isp router and I don't want to buy another router as It will be caos for me. 

I have set the dns in router, and no other device use that dns, I have made reserve it. So can I possible to set it's link ip automatically update, as ddns is not available or any other way to accomplish my need pl.

Okay if any router is cheap and have cli pl. Tell me.