[supriyo-biswas]

You're looking for a CDN with an integrated storage service, bunny.net has that feature[1]. They also have a volume tier for cheaply serving files[2] which seems to meet your need for a low PoP count (with some discounts to go along with it).

[1] https://support.bunny.net/hc/en-us/articles/360017093479-Und...

[2] https://bunny.net/network/