What is this seating insert?

I’ve been seeing pictures of this type of seating insert at multiple builds. Can anyone share a link of where you get it from? Is it a stroller insert?
Thank you!

IMG_1071

I have found them on ebay and other sites in the past, there is usasully a teady bear in what looks like a 5 point harness.

I think this is similar?

And theres this thread.

Looks closest to this one from Tmart.

https://www.tmart.com/Portable-Thickened-Baby-Child-Safety-Car-Seat-Light-Blue-S_p364224.html?cc=USD&fixed_price=hk_intl&gclid=CjwKCAjw7O_pBRA3EiwA_lmtfvGgVnypckg1O0-QllgewXAQjx2a3ccTTqtvxHRftqxMOz9VKJpy6RoCO6wQAvD_BwE