Only the i7 models have a Thunderbolt port - yours does not, so the answer is no.  
can i add  enclouser intel arc gpu in  usb c port Dell inspiron 15 5510 intel i5-11320 h , does my laptop has thunderbolt 3 port??? i cant find information , but i see thunderbolt option in  software windows 11 . I need work for cyber security ,malware analysis , does any option improve my graphics performance by adding external intel gpu in dell inspiron 15 5510 
can i add intel arc gpu in dell inspiron 15 5510 i5-11320h usb c port ??