Unable to display large text fields in Kibana Markdown visualization

I have one field store in ES that has a big length, around 35.000 - 40.000 characters.
They are stored correctly in ES, I can see them in Discover page (mapped as keyword), but when I want to use them in a markdown visualization (Time Series) it is said that no data is depicted in, no records found.
Is there a property to change?
To consider large String fields?

I just found out that the Index has:

"ScreenshotBase64": {
            "type": "text",
            "fields": {
              "raw": {
                "type": "keyword",
                "ignore_above": 256
            "norms": false

but the .raw was not created.
How to fix it?

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