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You can put html tags in the help_text, and then use css to render a tooltip. For example,
fieldName = forms.CharField(help_text="<span class=\"tooltip\">?<span class=\"tooltiptext\">tool_tip_text_to_be_displayed</span></span>")
And then use css like this w3s example:
<style>
.tooltip {
position: relative;
display: inline-block;
border-bottom: 1px dotted black;
}
.tooltip .tooltiptext {
visibility: hidden;
width: 120px;
background-color: black;
color: #fff;
text-align: center;
padding: 5px 0;
border-radius: 6px;
position: absolute;
z-index: 1;
}
.tooltip:hover .tooltiptext {
visibility: visible;
}
</style>
Source:stackexchange.com