Flexicontent v5 use joomla templating system you can use plain text or html to generate your email notification

1 go to email templating
2 filter flexicontent in component
3 you can edit each email notification

you can use any flexicontent value like {field_fieldname} or {fieldname}

Conditionnal

{if variable}    true
{if !variable}    false
{if variable empty}    Strictement empty
{if !variable empty}    not empty

{if x=valeur}    1 value true
{if x!=valeur}    not value equal
{if x in a,b,c}    1 value in list
{if x not in a,b,c}    no value in list
{if x contains texte}    1 value in text
{if x not contains texte}    no value in text
{if x>n} >= < <=    numerique comparaison

exemple

{if catid=11}
content for categorie 11
{/if}

{if incat in 18,19}
content for multicategorie item
{/if}

{if !field_description}
content if description is not empty
{else}
Description : {FIELD_DESCRIPTION}
{/if}

{if field_price>=250000 and field_floors=3}
content if field price have value between 250000 and 3
{elseif field_price>=100000}
or after 100000
{/if}

{if field_tags contains "maison"}
Maison
{/if}

Operator

&& || ! are supported