use JSONField instead of TextField

[hosseinmp76]

is there any reason not to use jsonfield for fields with json value stored in them?

[auvipy]

at that time there was no native jsonfield support

[hosseinmp76]

Thanks for your reply.
Is backward compatibility an issue? If not, I would like to make a PR and change them if you wish.

[auvipy]

it is and issue, but lets not limit that for any innovative solution, I request you to come up with a draft PR to showcase your improvement.