I need to check if the value exists after giving save, but the value is a form control when i use verify option the label give me back " ", because the input directly extracts the data from the json
PD: im new in katalon and sorry for me bad english 
When you tried to verify your value, did you try:
WebUI.verifyElementAttributeValue(findTestObject('Page_MicuartelFront/input_Nombre_mat-input-4'), "value", '208542723', 10)
In the lower part of the HTML section, there should be a list of properties that the element has. Can you scroll through the list and see if you can find which property has the reference, 208542723? Substitute that reference for the “value” in the statement above if it does not verify our element’s data.
Difficult to understand your problem. Have a look at the following guidance, and please try to explain your problem a bit more clearly — what did you expect to see, what did you actually see?
Ty guys. I fix the problem using Ws verify element.
the problem is that the value was extracted directly from the json and dont show the value in the html