How to transfer data to post request as json (using SoapUI)?

Question

JSON

Good afternoon! Please help with data transfer to POST-request as Json!
I need to transfer data to a post request. Post request must have content-type = multipart/form-data. From one request, I get the mediaId I need and try to insert it into another Post request. I just don’t know how to insert the following json structure into the mediaIds parameter:
[
{
"mediaId": "4e2c056931d398831128ad2c6a45ec91",
"type": 1
}
]
Now, instead of this, I simply pass "4e2c056931d398831128ad2c6a45ec91".
I need to somehow add the type, and what it is equal to. I ask myself. It turns out that I need to pass the second static parameter to mediaIds in the target request. Can this be done through Property Expansion and how? And if just through request?