No. You only have one bonus action per round, and both Two-Weapon Fighting and Crossbow Expert use your bonus action.
The Two-Weapon Fighting rule states:
When you take the Attack action and attack with a light melee weapon
that you're holding in one hand, you can use a bonus action to attack
with a different light melee weapon that you're holding in the other
hand. You don't add your ability modifier to the damage of the bonus
attack, unless that modifier is negative.
If either weapon has the thrown property, you can throw the weapon,
instead of making a melee attack with it.
As you can see, Two-Weapon Fighting (which the Dual Wielder feat enhances) grants you an additional attack that uses your bonus action. The additional attack granted by the Crossbow Expert feat uses your bonus action as well. And you can only take one bonus action per turn:
You can take only one bonus action on your turn, so you must choose which bonus action to use when you have more than one available.
As a side note, wherever you are pulling your information from is not correctly quoting the descriptions of the feats.
The description of the Crossbow Expert feat should read (PHB, p. 165):
Thanks to extensive practice with the crossbow, you gain the following benefits:
- You ignore the loading property of crossbows with which you are proficient.
- Being within 5 feet of a hostile creature doesn’t impose disadvantage on your ranged attack rolls.
- When you use the Attack action and attack with a one-handed weapon, you can use a bonus action to attack with a hand crossbow you are holding.
The description of the Dual Wielder feat should read (PHB, p. 165):
You master fighting with two weapons, gaining the following benefits:
- You gain a +1 bonus to AC while you are wielding a separate melee weapon in each hand.
- You can use two-weapon fighting even when the one-handed melee weapons you are wielding aren't light.
- You can draw or stow two one-handed weapons when you would normally be able to draw or stow only one.
