Forma chair:
505 x 525 x H 775 mm
https://kemerovo.inmyroom.ru/products/1427973-stul-forma-belogo-cveta 

Without Turbosmooth modifier:
Polys: 1,776
Verts: 1,756
With Turbosmooth iterations 2 modifier:
Polys: 56,512
Verts: 28,256

The Turbosmooth modifier with Isoline Display was applied to the required objects;
There is an FBX file (if necessary, apply the Turn To Poly modifier to the FBX file);
For Corona render, it is recommended to install version no lower than 1.5, since the glossiness of materials is configured taking into account PBR.