JSON DropDown
The JSON DropDown data-type enables a developer to populate a drop-down list from an external JSON source.
XSLT example
The JSON DropDown data-type provides a pipe-delimited value, which you can split using the "umbraco.library" function.
<xsl:template match="/">
<xsl:for-each select="umbraco.library:Split($currentPage/*[name() = 'YourChosenAlias' and not(@isDoc)], '|')/value">
<xsl:value-of select="text()"/>
</xsl:for-each>
</xsl:template>