Importing .json to SoapUI free version

I am able to import the .xml file to soapui but, my company development team has provided me with the .json file and I have bangged my head everywhere to search and explore and have tried muiltiple options and no luck.

I am testing in Rest API, I was able to use postman by simply importing the file and it created all the GET and POST request for me to manually execute them but, now I need to automate it and I would rather use SoapUI than UFT. I am not sure if I need to set up the environment because in postman I was provided with the baseURL and hostHeader url I know where does the baseURL (EndPoint) will go and do not know where does the hostHeader url will be placed. I was able to execute the GET method by simply adding the EndPoint and Resource value but, for POST method I am recieving 500 error. I can't just simply input the .json file as because it's different for each method contaiting differect information in one file.

I also tried to convert from .json to xml but, that file doesn't work when I upload it just shows a blank project.

I can't use postman because in the free version there is no postman import plug-in option.

If anyone can guide me as to how can I import a .json file so that it will create and display all the GET and POST menthods which are layed out in the .json file step by step would be highly appreciated.

I am not sure what information to share from SoapUI so please ask and I will do my best to share that info.